5W40 or 15W40 in 6.7 CTD?
So the owner's manual in my 2015 Ram says to use 15W40 oil in the 6.7 Cummins diesel, unless the temp is going to routinely be below 0*, in which case you should use 5W40. Here on Long Island, the ...
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otrfun wrote:
If Ram didn't require a 6-mo. OCI (truck's still under warranty), we'd probably use 5w-40 (3 gal. ~$60). However, we can't justify the extra expense for synthetic every 6-mo. Only put about 5k - 6k mi. on the truck between each 6 mo. oil change. We typically use whatever brand of API CK-4, 15w-40 that's on sale at Sam's Club or Costco (3 gal. ~$30).
Well even if it is a bit more I like to be constant with the oil I put in my engines, and like it to be good quality.
This is part of the reason why, this is the tappet gallery on our 2001 Ram CTD at 300,000 miles.
