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.

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.

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.

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.

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.

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).

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.

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.

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.

In modern vehicles, there is no risk of AMSOIL motor oil leaking. In fact, AMSOIL motor oil is fully compatible with modern seal materials. It is properly formulated to condition seals, keeping them pliable to prevent leakage.

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

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.

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

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

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

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.

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

If a gas is escaping or an electrical line is penetrated, the excavator is required to notify emergency personnel, notify the operator, and take reasonable steps to minimize hazards to persons and property until either the operator's personnel or emergency first responders arrive on scene. Examples of reasonable steps would be to keep traffic clear of the area where the damage occurred or to evacuate the public in the area.

You could be using the wrong filter. Our coffee filters are designed to specifically fit all Bunn Home Coffee Makers; other filters may cause problems.

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.