Quote:
Originally Posted by oil pan 4
There is only about a 1% difference between that thin stuff and what you are supposed to be using.
According to Cummins there is only about a 3% difference between 15w-40 and 0-20 oil, for fuel economy.
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I interviewed for Cummins to work in their engineering department and they are so mixed up and confused I would not put full faith in any information from them.
Some of the world's best engines though. But it's an old formula they keep repeating.