Myth 1: Since full synthetic oils are high performance products, they’re not compatible with my old car or truck.

 

The truth: Full synthetic motor oils, which deliver increased lubricity and reduce the running temperature of automotive engines, are ideal for your brand-new sports car and your 20-year-old truck.
 

Myth 2: Once synthetic oil, always synthetic oil.

 

The truth: Certain professionals and hobbyists may recommend the exclusive use of synthetic engine oils. But going back to conventional oil—or alternating between the two—will not harm your engine in any way.
 

Myth 3: Synthetic engine oil will cause my vehicle to leak or consume more oil.

 

The truth: Full synthetics do not damage seals or cause increased oil consumption. However, they may remove earlier oil deposits, which can reveal pre-existing conditions. “New” leaks are most commonly a sign of seals and gaskets that were already in poor condition. In such a case, even if an oil spot was never seen on the ground, dirty oil residue will be observed on the exterior of the engine, indicating a pre-existing leak. The two most common root causes of a perceived increase in oil consumption are: 1. oil consumption that has always been there, but that is now apparent because of the longer oil drain interval (not indicative of a problem); and 2. The removal of piston ring deposits that cause and actual, but temporary, increase in combustion blow-by and oil consumption.