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Q.
I sometimes hear "Synthetic oils contain
detergents that can make the oil seals leak in older cars." Is this
really an issue? How old would a car have to be to not use
synthetics?
A.
Synthetic lubricants do have an inherent
detergency that cleans and removes conventional motor oil deposits
left over in an engine. However, motor oils are designed to help
swell seals slightly to prevent leakage. The only time you would
observe seal leakage is if the seals are already damaged or showing
signs of leakage around them. As long as the vehicle has been well
maintained, and in good mechanical condition, it can be switched to
a synthetic lubricant at any mileage.
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