ltr450crbm wrote:My reason for recommending the mineral crap oil initially over a synthetic comes from experience with Japanese cars.
I have raced Subaru Impreza WRX STi for several years.
Guys in the club would often melt pistons from running too high boost.
We have seen on many occasions, that engines run on synthetics from day one, would not be run in properly.
The pistons would show glazing, not smoothly run in surfaces.
The highest mileage engine was 108 000 km when taken apart and showing this phenomenon.
I don't know about GM material quality but the Subarus were excellent.
So my issue is not the synthetic not lubricating well, but lubricating too well for the engine to run in.
A synthetic can easily run for 20 000km if the car is driven on road only.
BTW , how much is oil testing ?
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