Originally Posted by Junkman

Neither my 84 or 85SD will spin fast enough to start in the winter on dino oil. They are good without plugging in with synthetic and relatively mild TN winters.

Perhaps send off to Blackstone and have an oil analysis to determine status of current oil. The Ram takes 3 gallons of Rotella full synthetic so having data to justify longer periods between oil changes is worth the price of analysis. I was told that I could increase from 10,000 to 13,000.

The SDs hold considerably less oil so the same economies don't hold. I may send of a sample at my upcoming change prior to winter anyway to have a starting point.