Yes. Royal Purple’s XPR racing oils are fully formulated synthetic motor oils with complete additive packages needed for long-term use. XPR’s ultra-light viscosities, XPR 3.1 and XPR 0W-10, are typically only suitable for dedicated competition engines that are built to use low viscosity engine oils. Traditional viscosity grades, XPR 5W-20, XPR 5W-30, XPR 10W-40 and XPR 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. Please note: Royal Purple’s XPR racing oils do not conform to API and/or ILSAC licensing requirements and should not be used when manufacturers’ warranties are an issue.
Royal Purple’s API-licensed synthetic motor oils are formulated to provide unparalleled performance and protection and comply with API / ILSAC specifications and chemistry restrictions. Our racing oils are formulated completely differently than the API-licensed engine oils and do not conform to any chemistry restrictions. The XPR engine oils are maximum effort, no compromise performance upgrade engine oils that provide the highest level of performance and protection available in a 4-stroke engine oil.
Royal Purple’s involvement in motorsports is primarily for research and development purposes. Racing aids us in developing new and inspiring products. We are highly selective with whom we decide to work with and limit our involvement to a few select racers/teams. Please visit our sponsorship opportunity page for more information.
Royal Purple has several options for racers. Our 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 oils offer an even greater performance increase than the API-licensed or HPS synthetic 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 20W-50 racing oil would be safe using Royal Purple’s HPS 20W-50 motor oil or upgrading to Royal Purple’s XPR 20W-50). The tolerances to which the motor was built can play a role in an oil recommendation. Looser specs (e.g. greater than .003″) might require heavier weight oil than a motor built to tighter specs (e.g. .002″) 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. Please contact the Royal Purple Automotive Technical Department for more assistance in selecting the optimal engine oil and viscosity grade for your specific application.
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 performance upgrade synthetic engine oils (HMX and HPS) will still perform better than conventional racing oils; however, significant fuel dilution will reduce the effectiveness of these oils much more than the XPR oils.
We recommended using Royal Purple Break-In Oil, formulated to allow rapid seating of new piston rings while protecting rotating and valve train assembly components. As a general rule, follow your engine builder’s guidelines. On engines built primarily for street duty, the piston rings typically take several hundred miles to seat adequately. In dedicated competition engines, the piston rings often seat within the first three or four times the engine put under significant load and throttle. After the rings have seated, the best choice is to change the oil to a Royal Purple performance upgrade synthetic motor oil like HPS or XPR.
Yes. Royal Purple synthetic engine oils are compatible with any engine bearings, with special coatings or plain.
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 current type of oil and oil change interval. If the engine uses conventional/mineral motor oil, the change interval can safely be doubled or tripled using Royal Purple HPS or XPR oils. If the motor oil is another synthetic, the change interval can be safely doubled when using HPS or XPR oils.
In most instances, vehicles with properly functioning cooling systems can expect to realize a reduction in oil temperature of 5-20°F by using Royal Purple HPS or XPR synthetic motor oils.
Retailers choose the products they elect to stock and order for myriad reasons. Consumer-centric retailers will order any of the products we offer. A number of online retailers carry an extensive selection of our consumer products.
Royal Purple’s line of Nitro Plus engine oils have been specially formulated for use in high power nitro and blown alcohol applications.
For the 5 speed transmission, Royal Purple’s Racing ATF or XPR 0W-10 motor oil is recommended. For a 3 speed, Max ATF or Synchromax is the best bet.
The noncorrosive, extreme-pressure additives used in Royal Purple Max 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.
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 and any engine oil may suffer the effects of severe fuel dilution.