Quote:
Originally Posted by PSFORD99
Not in my manual ,nor the diesel supplement does it say what you are saying. What it does say is 5W-40 synthetic is recommended at below 0 degrees,
and 15W-40 above 0 degrees . Although 5W-40 can be run at the same temperatures above 0 degrees as the 15W-40 is ran at . In other words both can be run above 0 degrees , but only 5W-40 synthetic below 0 degrees .
The reason is cold weather starts at 0 or below.
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I must retract my statement as you are correct. I reread it and it does say recommend in cold temps. but why would the dealer say Not recommended and void warranty if used in normal temps?
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2017, 3500 Ram Big Horn, 4x4, Crew Cab, DRW, Aisin Transmission, 4:10. Curt Q20, 2014 Mountaineer 331 RLT, Sailun's on the rv and truck.
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