โOct-31-2020 06:30 AM
โNov-04-2020 05:16 PM
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
โNov-04-2020 02:04 PM
ShinerBock wrote:
There is not much difference in a used oil analysis between 15k oil at a year and 15k oil at 6 months. The detergents and other compounds in the oil is slightly less, but still well within spec. In fact, it would be next to impossible to tell the difference between the two.
Some like to error on the side of caution because they do not know any better, and I get that. If you have never performed a UOA to know exactly how oil holds up, then by all means change it every 6 months if it makes you feel better and is "cheap insurance" to you. I, on the other hand, would rather know and have hard data when making such decisions. I change it once a year because I know there is no significant difference between the two time frames based on UOA's from my own truck and the thousands of 6.7L Cummins engines we perform UOA's on at work.
โNov-04-2020 10:09 AM
โNov-04-2020 09:49 AM
otrfun wrote: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
โNov-03-2020 04:28 PM
Edd505 wrote:
Rotella T6 and never worry
โNov-03-2020 07:37 AM
โNov-03-2020 06:30 AM
โNov-02-2020 08:55 PM
otrfun wrote: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
โNov-02-2020 07:06 PM
โNov-02-2020 06:46 PM
โNov-02-2020 10:37 AM
โNov-02-2020 09:57 AM
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
โNov-02-2020 05:31 AM
BurbMan wrote:
This is what the owner's manual says:
โNov-01-2020 12:20 PM
โNov-01-2020 11:56 AM
ShinerBock wrote:BenK wrote:
IMHO...depends on how hard you plan to drive it...
I'd go higher viscosity
Both have the same viscosity grade of 40 at operating temp so they are about the same when driven hard with 15w40 having the slight edge. It is their cold temp viscosity grade that is different which mainly only comes into play when the oil temp is below 30F. One has a cold viscosity grade of 5W and the other 15W.
Snip....