Originally Posted by Liquidswords32
what is a wear switch
Conventional oil (dino oil) and blends part dino and part syn. will breakdown and "coke" inside your engine. that black hard stuff you see on the the inside of your oil cap or inside the engine. This is because the temperature that dino oil vapors at is a lot lower than syn. oil.
Ester based syn. oil has better resistance to heat and doesn't breakdown like dino oil does, therefore it protects your engine from wear a whole lot better "the wear switch".
I have seen engines go 400,000 miles with little or no wear of the bearing, journals, valve guides etc.
It is a myth that switching from dino oil to syn. oil will cause a high mileage engine to leak. If anything the syn. oil will help your old engine seals last longer and will help keep your internal engine cleaner.