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Old 10-05-2011, 10:57 PM   #2
Scooby Newbie
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Woolley
1998 Ram 2500


Well, your owner's manual says that it requires oil marked "SM" and "Energy Conserving", and I don't think the T6 fulfills both requirements. The manual also says that 5w30 synthetic should be used for optimum engine performance and protection.

YMMV on that one, but if it comes down to it, the T6 isn't an approved oil grade/type and therefore you're not going to win this.

How did they know you were using 5w-40?
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CosmoTheCat is offline   Reply With Quote