Royal Purple's API-licensed motor oils are formulated specifically to meet current American Petroleum Institute (API)1, International Lubricant Standardization and Approval Committee (ILSAC), and European Automobile Manufacturers Association (ACEA) specifications for new vehicle warranties. Over the last several years, these specifications have become increasingly stringent on certain additives, particularly those commonly used for anti-wear. As such, the new warranty restrictions aren't the best solution for consumers that have modified their vehicle or those simply looking for the greatest performance.
HPS is formulated with these consumers in mind and includes a dramatically enhanced anti-wear package. HPS is also the choice for those seeking to maximize horsepower and torque, while reducing wear, heat, and fuel consumption. HPS is the most robust engine oil Royal Purple makes for non-racing applications.
No. Testing has shown no short- or long-term adverse affects on catalysts in mechanically sound vehicles.
Absolutely. All viscosity grades of HPS, excluding 5W-20, are formulated for use in gas and/or diesel engines and are ideal for those with modified diesels or those simply looking for more performance out of their diesel.
Yes. Royal Purple lubricants are fully compatible with mineral or synthetic oils. No special procedures are necessary when switching to Royal Purple.
Yes. Mileage and/or age is not a factor when used in a mechanically sound engine. In high-mileage applications, Royal Purple recommends running a minimum of two short 3,000 mile intervals before extending the oil drain intervals. This will enable Royal Purple's high solvency to remove existing deposits gradually; such deposits can restrict oil flow, if excessive, as well as reduce the oil service life significantly.
Properly formulated synthetic oils will generally not cause an engine oil leak. Synthetic oils possess a higher degree of natural solvency, which can clean and remove deposits left by previous oils. The removal of extensive oil deposits can expose marginal or damaged oil seals, which may then leak. If an engine currently has excessive oil consumption (i.e. greater than 1 quart/1,000 miles) the recommended course of action is to solve the oil consumption problem before switching to a synthetic.
Yes. Royal Purple currently offers many viscosity grades of API-licensed motor oils. To allow for proper break-in of the engine, Royal Purple recommends waiting until the manufacturer's first scheduled oil change or a minimum of 2,000 miles in new gasoline engines.
Royal Purple suggests adhering to manufacturer's recommended oil change intervals for vehicles under warranty using its API-licensed SAE motor oils. With Royal Purple HPS, drain intervals may be extended to 12,000 miles or one year, whichever occurs first in street-driven, mechanically-sound vehicles.
Royal Purple suggests adhering to manufacturer's recommended oil change intervals for vehicles under warranty. Vehicles no longer under warranty using Royal Purple 15W-40 diesel engine oil can extend oil change intervals up to 15,000 miles or one year, whichever occurs first in street-driven, mechanically-sound vehicles.
While no special oil filter is required, Royal Purple recommends upgrading to a high-quality oil filter. A high quality filter will prevent contaminants from circulating through the system and causing damage.
Yes. Royal Purple motor oils are composed of a proprietary formulation of synthetic base oils and synthetic additives containing iso-paraffinic diluents.
No. Royal Purple strongly recommends against using any oil additives as do most automotive manufacturers. Engine oils are formulated with a fine balance of additives (anti-foam, corrosion inhibitors, anti-wear, detergent/dispersants, oxidation inhibitors), and more is not necessarily better. The use of an oil additive could upset the balance resulting in reduced performance.
No. The dye that is used to color the oil dissipates shortly after being put into service. The color will turn brown at some point.
Yes. All Royal Purple engine oils contain the zinc/phosphorus compound zinc dialkyldithiophosphates (ZDDP). But the maximum amounts are restricted by the current API oil specifications. For stock, non-performance automotive street applications that have flat tappet cams, API SN licensed oils are OK. For better wear protection. Royal Purple HPS and XPR lines of engine oils are formulated with a higher concentration of the zinc and phosphorus anti-wear additive and are suitable for ALL flat tappet and roller tappet camshaft valve trains.
Yes. For stock or mildly modified flat tappet valve trains (>.525” lift), Royal Purple recommends its HPS or XPR engine oils.
Yes. Royal Purple's XPR racing oils are fully formulated engine oils with complete additive packages needed for long-term use. XPR's ultra-light viscosity grades, XPR 3.1 and OW-10 are typically only suitable for dedicated competition engines that are built to use low-viscosity engine oils. Non-ultra light viscosities, XPR 5W-20, 5W-30, 10W-40 and 20W-50, may be used in street driven and daily driver applications, street and track duty vehicles and dedicated competition applications with gasoline or exotic fuels. Pleas note: Royal Purple's XPR racing oils do not conform to API and/or ILSAC licensing requirements and should not be used when manufacturer's warranties are an issue.
Yes. Royal Purple's lubricants can be used with exotic fuels. For the best protection. Royal Purple has formulated its XPR specifically with this in mind. The XPR oils are formulated to combat fuel emulsification to hold up even better than Royal Purple's other engine oils in alcohol and methanol applications. Royal Purple's other synthetic engine oils will still perform better than conventional racing oils; however, significant fuel dilution will reduce effectiveness of these oils much more than the XPR oils.
In most instances, vehicles with properly functioning cooling systems can reduce oil temperatures by 5-20°F by using Royal Purple.
Royal Purple's motor oils are formulated to provide unparalleled performance and protection and comply with API/ILSAC specifications. Its racing oils vary in viscosity and formulation as compared to the SAE motor oils to provide the greatest performance gains possible without regard to API, SAE and/or ILSAC specifications.
No. Royal Purple has not found any evidence that it shows deterioration in performance after being subjected to race conditions. It is possible that fuel dilution contamination may start to hinder the performance of the engine oil; however, dyno results do not support this claim.
Royal Purple has several options for racers. RP HPS engine oils are formulated to outperform many of the “racing” oils on the market, but Royal Purple’s XPR racing oils redefine the category. Royal Purple XPR offers an even greater performance increase than its SAE engine oils. With that said, the following are some guidelines to determine which products to use. As a point of reference, Royal Purple recommends using a racing oil that is closest in viscosity to the oil the race car is currently using (e.g., a racer using a conventional or synthetic 20W50 racing oil would be safe using either Royal Purple’s HPS 20W50 motor oil or upgrading to Royal Purple’s XPR 20W50). The tolerances to which the motor was built can play a role in an oil recommendation. Looser specs (e.g., greater than .0033) might require heavier weight oil than a motor built to tighter specs (e.g., .0023) to maintain idle oil pressure. Keep in mind that it is much easier to be conservative and use heavier weight viscosity oils and then go lighter when experience and comfort level dictate
Royal Purple recommends using Royal Purple Break-In Oil, formulated to allow optimal ring seal and protect rotating assembly components. As a general rule, follow your engine builder’s guidelines. On street setups, the rings should seat within the first three or four times the engine is brought to temperature. After the rings have seated, change to Royal Purple.
Yes. You may use Royal Purple HPS or XPR engine oils on newly coated bearings without needing a mineral oil break-in period.
This can vary depending upon application and the level (amount) of contamination (i.e., dirt, fuel, water, etc.). A good rule of thumb is to find out the racer’s current type of oil and oil change interval. If the racer is using petroleum oil, you should feel comfortable doubling or tripling their change interval. If the racer is running another synthetic, you can feel comfortable doubling their change interval.
For the 5-speed transmission, Royal Purple’s Racing ATF or XPR 0W10 motor oil is recommended. For a 3-speed, Max ATF is the best bet
The noncorrosive, extreme pressure additives in gear oils do give off a distinctive odor, which can be magnified under extreme racing conditions. This is normal for API-GL5 hypoid gear oils containing sulfur/phosphorus extreme pressure additives.
Yes. A rotary engine is a modified four-cycle engine that recommends the use of an API-licensed motor oil for street applications.
In a rotary engine, the oil lubricates the eccentric shaft bearings, thrust needle bearings and rotor bearings (similar to a crank and rod bearing of a piston engine). It also is injected into the combustion chambers to lubricate the apex seals, corner seals, and side seals, all of which helps to create the sealing mechanism (the equivalent job of the piston rings).
Royal Purple provides outstanding protection for the e-shaft, rotor bearings and thrust bearings and is suitable for the oil injection system as it has proven to run cleaner than other oils and is an excellent choice for rotary apex seals, corner seals, and side seals.
Royal Purple has performed seal compatibility testing on the components used in a rotary with excellent results — including older rotary engine seals dating back to the Cosmo. Royal Purple’s Technical Services Manager David Canitz (who has been an owner and racer of rotary engine cars using synthetic motor oils since 1985 with excellent results) has been trying to find an answer to this Mazda statement for the last 18 years.
In the early development of synthetic oils decades ago, there were purportedly some seal compatibility issues. Today’s synthetic oils do not have the compatibility issues of the old oils. There is no substantiated evidence of seal compatibility issues with Royal Purple.
Here are some facts:
If this was a problem with synthetic motor oils in general, then all internal combustion engines using a ‘synthetic’ would experience increased deposits on internal surfaces. The opposite is actually the norm. Conventional four-cycle motor oils will typically leave deposits of carbon and ash when injected into the rotary apex seal, corner seal and side seal areas. Royal Purple’s motor oil burns cleaner due to its synthetic base stock being free of contamination and the fact that many of its additives are ‘ashless.’ This may not be true for all synthetics but Royal Purple has been proven to work extremely well in rotary engines. Royal Purple’s formulation of synthetic hydrocarbon motor oil burns at the nominal combustion temperatures experienced in both street and racing applications, whether normally aspirated, turbocharged or supercharged. (500 – 1700%°F idle to race rpms typical combustion temps)
No. Royal Purple’s motor oil is fully compatible with the elastomers found in rotary engines as well as more conventional piston engines. The oil seals, housing seals and other elastomers used in rotary engines typically consist of Buna N, Nitriles, Neoprene or Viton materials, which are also commonly found in piston engine cars.
No. If an engine’s sealing surfaces are in good condition, synthetic oil should not cause any leakage. However, if an engine has marginal seals, there is a 50/50 chance the seals will leak. A synthetic motor oil is going to have similar viscosity to that of a conventional motor oil – except at extreme temperatures. Due to a flatter viscosity curve, at low temperatures it will not thicken as much (easier winter cranking) and will not thin out as quickly at higher operating temperatures (better oil film at higher rpm).
Royal Purple recommends that the maximum oil drain/filter change interval listed in the Owner’s Manual be followed while under warranty (new RX8). For FA, FB, FC, FC Turbos and FD rotaries, extending drain intervals from two- to five-fold is possible if desired. Since the rotary engine injects oil through the use of a metered oil pump, either adding oil into the carb base plate air/fuel mixture or directly injecting oil into the rotor housing, rotary engines will consume oil of one quart per 1,000 – 3,000 miles. It is important to maintain the proper crankcase oil level in your rotary engine if you decide to extend oil drain intervals.
In an ideal world, the rotary engine metered oil pump should inject an ashless oil designed to burn in the combustion chamber and use a four-cycle oil in the crankcase for the eccentric shaft, rotor bearings and thrust bearings. For the street, Mazda simplified the OE system to use just one oil, that being a typical four-cycle oil for both the e-shaft as well as the combustion chamber. Royal Purple recommends using the standard HP 2-C if the metered oil pump is still enabled. The two-cycle oil being added to the fuel tank is in addition to what Mazda designed to inject and acts as a supplement or insurance. Depending upon which engine, the level of modifications (street port, Bridgeport, peripheral port, nitrous turbocharged) and application, the typical mix ratio could vary from 200:1 to 800:1.
For a pure racing application where the metered oil pump has been disabled or removed, again based on the actual engine and modification level, the ratio could vary from 150:1 to 600:1. For this application, Royal Purple recommends the XPR 2-Cycle XPR 2-C or the standard HP 2-C.
A stock FD twin turbo 13B with the MOP oil injection system can typically use about one quart per 1500 miles under hard street driving. If this vehicle is getting 15 mpg, the gasoline to oil ratio is 400:1. If the oil consumption on this vehicle reduces to 1 quart per 2,500 miles and fuel efficiency increases to 20 mpg, the gasoline to oil ratio increases to 600:1. The stock metering oil pump is a great system as it varies with throttle position (load on the engine). Pre-mixing has to be calculated for the ‘worst case’ that will be seen by the engine for that fuel load. Under racing conditions, that’s wide open throttle at racing rpms. This means that at idle, the ratio may be slightly fat (rich).
Purple Ice should not be used with other heat-transfer or cooling enhancing products or "water wetters." If such a product has been used in the cooling system, the system should be drained and flushed before using Purple Ice.
Purple Ice is compatible with cooling system additives intended to stop or slow leaks. Please note that such stop-leak products typically put a coating on the interior surfaces of the cooling system, so the effects of Purple Ice may be diminished.
Purple Ice is compatible with all current OEM/factory and major brand automotive anti-freeze. This includes traditional green ethylene glycols, as well as OAT/HOAT antifreezes (e.g., DexCool; Ford and Chrysler orange, gold, pink; European and Japanese OEM red, pink, etc.).
Purple Ice may be added to any antifreeze/water mix; however, testing has shown higher water concentrations yield greater cooling benefits. While Purple Ice does contain corrosion inhibitors as well as lubricants to compensate for a lower antifreeze/water concentration, Royal Purple recommends using the concentration of antifreeze appropriate for the cold winter temperatures in your area, because Purple Ice offers no freeze or boiling protection. The preferred coolant mix would contain a minimum of 20% antifreeze (offers -10°F protection) to provide a higher boiling point, and greater corrosion and deposit protection for the coolant, along with 1 to 2 ounces of Purple Ice per quart of coolant.
When using Purple Ice with an antifreeze/water mix. Royal Purple recommends adding 1 ounce of Purple Ice per quart of cooling system capacity. For straight water (racing) applications. Royal Purple recommends adding 2 ounces of Purple Ice per quart of cooling system capacity.
When used with antifreeze, Purple Ice should be added once a year or every 30,000 miles, whichever comes first, in order to maintain proper performance. When using Purple Ice in a cooling system running straight water, Purple Ice should be added once a year or every 15.000 miles, whichever comes first.
No, a higher concentration of Purple Ice than recommended will not harm the cooling system or engine. However, going well beyond 2 ounces of Purple Ice per quart of coolant won't offer any additional cooling benefit, but may result in some foam generation in the system.
Yes. Purple Ice may be used in diesel engines for improved heat transfer as well as reduced cavitation.
Check your owner's manual for verification.
No. All viscosities of Max Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone differentials. No additional additives are necessary.
Yes. Max Gear is completely non-corrosive to soft yellow metals (brass, bronze, copper) so it is synchronizer-safe like a GL-4 gear oil. However, because of Royal Purple's proprietary Synerlec additive technology, Max Gear oils retain the load carrying and shock protection capability of a GL-5 gear oil.
Max ATF is an excellent, function replacement to these fluids; however, it is not a warranty-approved fluid. Consumers still under their factory warranty should remain with OE fluids, while those that have exceeded factory warranty may use Max ATF as a performance upgrade.
No, Max ATF is not recommended for use in CVTs.
For manual transmissions and/or transfer cases specifying a Ford Mercon® or GM Dexron® ATF, Royal Purple recommends either its Max ATF or, for greater performance, its Synchromax.
Follow the manufacturer's recommendations regarding viscosity. Most manufacturers recommend a 10W-40 for 4-cycle, liquid-cooled motorcycles. Air/oil cooled motorcycles typically specify a 20W-50. Check your owner's manual for verification.
Royal Purple suggests adhering to manufacturer's recommended oil change intervals for vehicles under warranty. Vehicles that are no longer under warranty can frequently double or triple the number of miles between oil changes depending on the vehicle, its condition, the way it's used (excessive idling), and the oil filter that is used.
For motorcycle 2-cycle and 4-cycle gearboxes with a separate reservoir, Synchromax manual transmission fluid is recommended.
Royal Purple Max-Cycle 10W-30. 10W-40 or 20W-50 motor oil may be used in the primary tank. For transmissions, Royal Purple recommends Max-Cycle 20W-50 or Max Gear 75W-90. NOTE: DO NOT use Max Gear lubricants in the primary.
For Evolution and Twin Cam motors, Royal Purple's Max-Cycle 20W-50 is recommended. If the owner's manual lists a 10W-40 or 15W-40, Max Cycle 10W-40 may also be used.
No. Royal Purple provides exceptional film strength for excellent metal-to-metal protection, yet it is also safe for use in wet-clutch applications.
Yes. Royal Purple uses a different additive chemistry than most manufacturers, which is the very foundation of the benefits RP offers. This technology has a distinctive odor, different from the common odor of exhaust gases to which most have become immune.
Yes. While the Royal Purple SAE and Racing engine oils may be used in motorcycle applications, its Max-Cycle line of engine oils have been formulated specifically for motorcycle engines and transmissions.
HP 2-C is recommended for stock oil-injection applications.
HP 2-C may be used in pre-mix applications.
Royal Purple HP 2-C meets the performance requirements of any 2-stroke gasoline engine; however it does not carry any OEM oil licenses.
No. Royal Purple's 2-cycle oils are formulated for use in gasoline applications only.