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I'm still using M1 0W40 in my M3, now the FS version.
Car drives the same, warms up fast, revs faster than my eyes can keep up.
M1 0W40 FS is still factory fill for cars like Porsche GT3s/GT2 RS and GTRs...so I doubt the "FS" version is worse than the old, if anything, the new GTL formulation is suppose to be better.
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