M20 & M32 Gearbox: Chocolate Bearings - Still Running Strong
n 2012, along with the bearing upgrade, General Motors changed the oil to GM 1940004. This one is most likely better (why else would they change the oil?), but I don’t believe that the original GM oil is the cause of the problems.
If you’re still not convinced, Fiat and Alfa Romeo cars don’t use General Motors oil. They use Tutella Matryx. The M32 gearboxes in Fiat and Alfa Romeo cars fail all the same.
The bottom line is that you should pick a good synthetic oil and replace it every 30,000 miles. The newer General Motors oil will do fine, however, there are better options available.
Good:
GM 1940004 75W-85 (General Motors factory fill since 2012)
Tutela Matryx 75W-85 (Fiat & Alfa Romeo factory fill)
Better:
Fuchs Sintofluid 75W-80 (recommended by many drivers and Vauxhall tuners, definitely the most popular uprated oil for the M32)
Red Line MT-90 75W-90 (slightly thicker than 75W-85 – better for track cars or in hot climates)
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