Thanks MLEE and Al.
Quote:
Originally Posted by waterman
The question however, remains somewhat unanswered; Is M1 ESP 0W-40, now a recommended fill for pre 2019 Gen 6 LT1/4?
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To get the answer let us ask ourselves: What fundamentally has changed with the design and material selection of the moving parts inside the LT1 and LT4 engines?
Maybe the low ash 0w40 oil just wasn't through R&D yet and it's just better at most things. It doesn't make the 5w30 bad or mean sticking with 5w30 will cause our cars to die a premature death... or does it?
But I think we already know the answer, and GM legal won't let Al confirm it.