Goose55
Senior Member
- Joined
- Aug 29, 2020
- Posts
- 756
- Reaction score
- 427
- Location
- Ajo, AZ
- Ram Year
- 2019
- Engine
- Cummins High Output 6.7L
In my last trip to Service I happened upon the Cummins authority there and his advice was really appreciated, so I thought I would share this information. I asked about why 12 quarts of oil becomes as dirty as it did at only 5,000 miles. True, diesel engine oil will turn black rather quickly but it also felt gritty and he told me that can really become an issue, especially for the push rods and rocker arms. So badly that they become noisy.
His advice was to change the oil religiously at 5,000. Also, in driving just around town as I often do, he said to use the gear limit toggle switch to down shift to keep the RPMs up. So, I now do that at 25 mph--so that the RPM is at or above 1,500, whereas before it was about 1,110. Also, in reading up again in the Owners Guide and Diesel Supplement (and because it is Winter now--though only mildly in S Arizona) my goal is not to ever shut the engine down before it has reached at or near operating temperature. So, if I have a brief stop at the Post Office or Circle K, I use the cruise control buttons to idle the engine up. After idling the engine up, I increase the RPMs further by tapping the "Resume" button so that it idles at around 1,300 or 1,400.
All this to help prevent un-burned diesel fuel from getting into the crank case.
His advice was to change the oil religiously at 5,000. Also, in driving just around town as I often do, he said to use the gear limit toggle switch to down shift to keep the RPMs up. So, I now do that at 25 mph--so that the RPM is at or above 1,500, whereas before it was about 1,110. Also, in reading up again in the Owners Guide and Diesel Supplement (and because it is Winter now--though only mildly in S Arizona) my goal is not to ever shut the engine down before it has reached at or near operating temperature. So, if I have a brief stop at the Post Office or Circle K, I use the cruise control buttons to idle the engine up. After idling the engine up, I increase the RPMs further by tapping the "Resume" button so that it idles at around 1,300 or 1,400.
All this to help prevent un-burned diesel fuel from getting into the crank case.