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Originally Posted by B-1 Pilot
Source for where 5w-30 is not recommended? Did 700 miles post breakin with this oil as this is the ONLY oil German M-qualified dealerships use at the moment. Worked just fine in the 50-65F weather. When I get back to craptacuoar Texas, I will switch to 0w-40....
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I don't think 5W-30 does any harm but it takes ages to warm up with that oil.
Which 0W-40 are you planning to use? Why 0W-40 and not 0W-30?