Yes, the XW-40 weight does matter; XW-30 is too thin for the M96 engine once it is warmed up. Considering your location, something like Castrol Syntec 5W-40 would be a good choice..........
The reason Mobil 1 has fallen from grace is that it has been reformulated into a poor performing shadow of what it once was.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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