Frequently Asked Questions

Q: Why are AMSOIL Motor Oils capable of extended drain intervals?

AMSOIL Synthetic Motor Oils are highly resistant to the destructive effects of heat, and do not break down like petroleum oils. This means that AMSOIL Motor Oils can provide much longer drain intervals than conventional lubricants.

Q:  Is there a recommended procedure for changing to AMSOIL Motor Oils?

There are no special requirements; however, in older vehicles or those with high mileage, it may be advisable to use AMSOIL Engine Flush first. This will ensure that the engine is clean and free of any accumulated contaminants which might have an effect on the service life of AMSOIL Motor Oils. In all cases, it is good judgement to install a new AMSOIL Absolute Efficiency Oil Filter (EaO) every time you change oil.

Q:  Should Oil Additives or After Market Products be added to AMSOIL Motor Oils?

No, they are not necessary! AMSOIL Motor Oils are properly formulated under the strictest Quality Control procedure to provide superior lubrication performance.

Q: Will AMSOIL Motor Oils void the warranty of a new vehicle?

Absolutely not! Manufacturers’ warranties are based upon the use of oils meeting specific API Service Classifications, for example, SJ/CF. (AMSOIL lubricants meet the current API Service requirements and, thus, are perfectly suited for use in any new vehicle without affecting the validity of the new vehicle warranty.)

Q:   Are AMSOIL Synthetic Motor Oils and petroleum motor oils compatible?

AMSOIL synthetic motor oils are fully compatible with all petroleum motor oils, and there is no danger in mixing the two. Mixing AMSOIL and petroleum oil, however, is not a recommended as a general practice. Performance and long drain intervals will be sacrificed and the oil should be promptly changed, at maximum, within the next 3,000 miles.

Q:  Is it true that installing AMSOIL or other synthetic oils will cause my engine to leak oil?

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.

Q: Is it true that once I change to synthetic oil I can't change back to petroleum oils?

NO, you can change back at any time.

Q: How long of a break in period is necessary before switching to synthetic motor oils?

When it is time for the first oil change or after the first 1,500 miles. This allows enough time to get out any contaminants from assembly. By allowing the engine to operate with the petroleum oil until the first oil/filter change interval, the wear metals and contaminants are removed prior to installing AMSOIL.
Some vehicles such as the Dodge Viper and Chevrolet Corvette come from the factory with synthetic oil and recommend the continued use of synthetic oil.
Diesel engines require a break in period of at least 10,000 before switching to synthetic oil.

Q: Can I use synthetic oil in my motorcycle?

Yes, AMSOIL synthetic motorcycle oils contains no friction modifiers and provide excellent wet clutch performance. AMSOIL has a complete line of oils for two-cycle bikes as well.
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