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Discussion Starter · #1 ·
Does anybody make a 5w40 non synthetic diesel oil recommended for Cummins. I use Rotella 15w40 for the summer, my truck is still in the break in mileage and I live in very cold climate in Montreal, Canada. The only 5w40 I seem to find is synthetic.
 

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Whats wrong with a synthetic??? What exactly do you think is break in for a Cummins???

Anyway, all the CG-4 oils I look up in the 5W flavor came up all synthetic.
 

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Discussion Starter · #3 ·
Cummins wants 20,000 miles before synthetic, I have 10k. The owners manual states 5w40 when colder than -18C, therefore I should be running 5w40 in winter however I cannot find a non synthetic 5w40. I stopped by the local Cummins shop and they were also confused but said they always run 15w40 all year round.
 
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