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471 Posts
What I got:

15w-50
75w-90

Mobil 1
 

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471 Posts
The 5w-20 is for emissions/mileage purposes. However, the engine tolerances have been tightened up as well. So you are going to get a lack of lubrication to these tighter tolerance bearings, additional wear will be seen over time.

The philosophy of "If it isn't broken, don't fix it" doesn't work when these things change.
 
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