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Royal Purple Synthetic Motor Oil

Royal Purple Synthetic Motor Oil


Why Should I use Royal Purple?

There are a variety of reasons to use Royal Purple, including increased horsepower, improved fuel economy, a cleaner engine with fewer emissions, reduced wear, reduced oil consumption, improved corrosion protection, and ultimately a longer lasting smoother and cooler running engine.

Why is Royal Purple better than other oils?

The superior film strength, created by the Synerlec technology in our oils, means that it offers 4 to 5 times better metal to metal protection than other oils, petroleum or synthetic.

Are Royal Purple products compatible with other petroleum or synthetic based oils?

Yes. Royal Purple lubricants are fully compatible with all currently available petroleum, petroleum/synthetic blends, or full synthetic based oils.

If Royal Purple street products are not 100% synthetic, why are they priced similar to a full synthetic?

The Synerlec technology provides the best protection and performance increases available, however, it is very expensive. We have blended our street oils to exceed the performance characteristics of any other blended or "Full" synthetic. If having a full synthetic is important, we have our racing line which can be considered a "Full" synthetic.

How often should I change Royal Purple in my passenger car?

If your vehicle is under manufacturer's warranty, we recommend following your manufacturers recommended oil change interval. If your If your vehicle is not under warranty, we recommend changing Royal Purple approximately every 10,000 – 12,000 miles. However, we recommend to continue changing the filter every 3000 - 5000 miles to minimize the accumulation of dirt, fuel and water.

Can I put Royal Purple into my brand new car?

We recommend switching to Royal Purple after the manufacturer's first scheduled oil change. This allows the engine time to break-in (seat the piston ring to the cylinder wall). The exception to this is the diesel pickup (Ford, Dodge, Chevy, GMC). These use a very hard piston ring under high compression and it takes longer for the rings to seat. In these applications we recommend switching to Royal Purple after 5000 – 10000 miles (depending upon engine loading).

Does Royal Purple meet the manufacturer's requirements?

Yes, Royal Purple is "API Warranty Approved", so it meets or exceeds the requirements of manufacturer's new car warranties.

I live in cold weather, what is the pour point of Royal Purple oils?

The pour point of all of our SAE grade oils is less than –30 F and varies from oil to oil. This should be more than adequate as ambient temperature does not get that cold and wind chill does not effec tmotor oil.

Will Royal Purple cause my engine to leak?

Royal Purple will not cause an oil leak. In some instances, usually in older engines that have not been properly maintained, there may be a bad seal or cracked gasket that is not leaking because it is filled with oil sludge, lacquer and varnish deposits. Synthetic oils are designed to carry away deposits, so it is possible to expose marginal seals after those pre-existing deposits are removed. If an engine leaks after putting Royal Purple or any other synthetic in, the oil is probably not causing the leak, it is exposing an existing leak. In these cases or in older cars where this might be a concern, it may be best not to recommend a very lightweight oil. In the long run, it is better to replace a faulty gasket than to leave those deposits in the engine.

What will putting Royal Purple into my older car do for me?

Royal Purple will breath new life into older engines. The polishing characteristics of the oil will help smooth out the cylinder walls and bearing surfaces. The film strength of the oil will help increase fuel mileage and keep the engine cleaner resulting in reduced emmisions, a big benefit to older cars.

Should I use an oil additive with Royal Purple?

No. We are constantly testing and have yet to find an additive that enhances the performance characteristics of Royal Purple. In fact, several of the additives, when added to our products can result in decreased performances rather than performance gains as claimed.

What should I use for a Manual Transmission Fluid (MTF)?

As always, if your car is under warranty, we suggest following your manufacturer's recommendations. In most passenger cars we recommend using Royal Purple Max Gear 75W90. Some people may want to use something lighter, in which case, our ATF or Racing 41 would be good suggestions. Racers may even want to run the Racing 21 which is fine. Many new cars now use an ATF or engine oil.

Will Royal Purple help shifting in my automatic transmissions?

Yes, Royal Purple Max ATF has shown time and time again to help automatic transmissions shift smoother and run cooler.

Is it approved?

Yes, Royal Purple Max ATF meets both Dexron Type III and Mercon III specifications.

Can I use Royal Purple in my Harley?

Yes. Royal Purple has had great success in the Harley market. For pre-Evolution motors, our SAE 50 is recommended. For Evolution motors, we recommend Royal Purple 20W50. For Sportsters, Royal Purple 15W40 can also be used. Additionally, Max Gear 75W90 is perfect for the transmissions.

My Harley has a primary oil tank. Can I use Royal Purple?

Yes, Royal Purple will work in the primary oil tank. We recommend using the 5W30, Racing 21 or Racing 41.

Is Royal Purple OK for use on a motorcycle with a wet clutch?

Yes, Royal Purple has been found to work very well in these applications.


What product should I use in my race car?

Royal Purple has several options for racers. Our "street oils" are formulated to outperform any of the other "racing" oils on the market. In addition, our line of Racing oils redefines the category. The Racing oils will offer even more protection than the street oils. With that said, the following are some guidelines that can be used when recommending which of our products to use.

As a starting point, we recommend the Royal Purple Racing oil that is closest in viscosity to the oil the race is currently using. Eg. Racer using Kendall 20W50 Racing currently would generally be safe using Royal Purple 20W50 or can upgrade to our Racing 41.

The tolerances to which the motor was built can play a role in an oil recommendation. Looser specs (e.g. greater than 3 thousandths) might require a slightly heavier oil than a motor built to tighter specs (e.g. 2 thousandths) to maintain idle oil pressure.

As there is an inherent tradeoff between protection and performance, the following may help. Keep in mind that it is much easier to be conservative and try a heavier oil and then go lighter when comfortable.

Can I run Royal Purple oils with exotic fuels (alcohol, methanol, nitrous-oxide, etc.)?

Yes. As illustrated above, Royal Purple lubricants can be used with exotic fuels. For the best protection, we have formulated our 11 and 41 Racing oils specifically with this in mind. These two oils are made to hold up even better than our other Racing oils in alcohol and methanol applications.

Does this mean that I should not run other Royal Purple oils with these fuels?

Not necessarily, our other oils will still perform better than conventional Racing oils, the 11 and 41 have specifically taken these uses into account.

How should I break in my racing motor with Royal Purple oil?

We recommend using a quality petroleum based oil for break-in purposes. As a general rule, follow your engine builder's guidelines. On street setups, the rings should seat within the first 3 or 4 times the engine is brought to temperature. After the rings have seated, change to Royal Purple. It is not recommended to break in an engine using Royal Purple, as the film strength of the oil may not allow proper seating of the rings.

Can I use Royal Purple with coated bearings?

Yes, You can use Royal Purple on newly coated bearings with no mineral oil break-in required.

How often should I change the oil in my race car?

This can vary dependent on 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 he/she is racing a petroleum oil, they should feel comfortable double or tripling their change interval. If he/she is running another synthetic, they can still feel comfortable doubling their change interval.

How will running Royal Purple effect my oil temperature?

In most instances, we have found that running our products can result in lowering oil temperatures by 5°-20° F.

Why might my oil temperature increase with Royal Purple?

There have been isolated instances where we have received reports of temperatures increasing. Due to the heat carrying capabilities of the oil, the oil is absorbing more of heat from the engine, and the oil is not being cooled efficiently. The solution would be a more effective oil cooling system.

What about running nitro-methane?

Our full line of "Nitro" oils, have been specially formulated for use in high power nitro and alcohol applications.

What do you recommend for a Lenko transmission?

For the 5 speed transmission, our ATF or Racing 9 oil. For a 3 speed, ATF is the best bet.

I notice a heavy odor from the gear oil after a race. Is this normal? Why?

The extreme pressure additives in the gear oils do give off a distinctive odor and this can be magnified under extreme racing conditions. This is normal for API-GL5 hypoid gear oils containing sulfur/phosphorous extreme pressure additives.

Is it true that Royal Purple oils lose their performances edge after 6 or 8 passes? (Drag Racing)

No. We have found no evidence that Royal Purple oils show 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.