Oil
We tested every type oil available at Cummins tech center.
Cummins marketed their premium blue which can be purchased on sale at Rural King for $12-13 a gallon. In todays world, if the oil meets the manufacturers specs, it is safe to use and will not void warranty.
I personally use full synthetic wherever possible. My diesels get oil pressure faster in the winter with synthetics. Other than that it is all about the additive package.
Clean oil and filter with the correct additives is probably more important than molecule size for most applications.
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Windsport 35C towing Jeep Wrangler Unlimited
Air lift bags, CHF, Steering stabilizer, rear trac bar.
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