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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rhagfo wrote:blofgren wrote:rhagfo wrote: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.
Wow, that looks great! I only use top quality oil as well along with OEM filters in all of my vehicles.
I order my filters from Geno's Garage, yea they take a week to get here, but I order replacements when I use the ones I have, just in case I get some bad fuel.
You may have said but that looks like you ran Delongs 400 with all the black streaks.
I did my killer dowel pin at 100k on my 98 12V pulling front cover. My truck was Delongs for the first 50k when I bought it I switched to AMZ/OIL 15-40 Diesel Marine. Did the same on my Dad's 94 12V at 120k, he used the AMZ/OIL after first change. My engine was clean but had a lot of black streaks on the front and under the valve covers. My Dads was a golden spotless clean on both locations.
Does it matter??? Who knows.
