Do Oil Additives Affect Engine Seals?
by FTE Published on Friday, February 6th, 2026
Do oil additives affect engine seals? Can oil additives harm seals?
I’ve reviewed numerous additive technologies.
Oil additives can sometimes temporarily swell seals, which may reduce oil leaks, but they can’t repair old, brittle seals.
Some additives are formulated to rejuvenate seal elasticity, but they can’t fix severe leaks or mechanical damage.
Before using any additive, check seal compatibility with the additive manufacturer.
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