Using a high-zinc oil with a high dose of ZDDP additives helps protect classic car and hot rod engines. AMSOIL Z-ROD Synthetic Oil contains 1400 ppm zinc.
In theory, your oil filter has a simple job: capture wear-causing contaminants and hold them in the filter media so they don’t run amok inside your engine. But lots of factors can throw a wrench into this plan, which can raise filtration questions.
Generally speaking, synthetic blends and semi-synthetic refer to the same thing: an oil that uses a combination of conventional and synthetic base oils in its formulation.
