Refer to your owner's manual for your vehicle manufacturer's oil change recommendation. Myth #3: Synthetic engine oils can wear down seals in an engine and cause leaks.. In fact, if your seals and gaskets are in good condition, synthetic oil will not leak in your engine.
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.
Synthetic oils typically provide better protection than conventional oils, but. back and forth between full synthetic and conventional oil will not damage the engine.