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:LIKE2BUILD wrote:I was just curious, thanks. We have an 8y/120k OEM extended warranty, so we'll be sticking with the 6 mo. OCI for a few more years/miles. If we still have the truck after 8/120 we'll probably go to a 12 mo. OCI using 5w-40.otrfun wrote:You're right, it does say 6 months. However, I'm comfortable with the additive packages in the synthetic oil and use the 1 year time frame. When I changed oil this summer I had only put 5,200 miles on the truck since July of 2019. If I would have changed oil at 6 months it would have been less than 25% used (on a mileage basis).LIKE2BUILD wrote:Our 2016 Ram Cummins OCI is 15,000 mi., 500 hours, or 6 months, whichever comes first. Your profile says you have a 2014 Ram Cummins. Is the OCI different for the 2014's?
. . . Another point for me is oil change frequency. The manual says to change oil every 15,000 miles or 500 hours and I don't even come close to that mileage in a year. So, I just change my oil once a year and with the 5W40 I'm covered for any temperature range and I don't have to worry about it.
KJ
KJ
With that being said, gotta wonder which would keep my Cummins runnin' the longest? 15w-40 changed every 6 mo. or 5w-40 changed every 12 mo.? lol! :)
It would probably make no difference as long as you aren't exceeding the mileage specifications. I'm not the least bit worried about the 1 year OCI that I have been using for several years now.
