Oil change intervals

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Lefty62

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2018 ram 3500 mega cab
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What is the interval between oil changes
Manual says 15000 miles with synthetic
I do it every 5000 miles
Do I follow what the screen says on the dash
 

crash68

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If your using a full synthetic oil, its a waste to change the oil sooner than 7500 miles or 1 year. Given it's a Cummins going 10K (or more) mile OCI is about on par, there's 3 gallons in that sump. If your changing because it's black, that's just because it's a diesel and no indication of the oil condition.
You'll get a lot of opinions on oil change intervals but if you really want to know, send a sample out to be tested
 

18CrewDually

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Around 2013 Ram changed it from 7500 to 15,000mi. Same engine. One of the reason they changed it to 15k is make it appear to the Feds and advertising that operating costs are less and uses less oil on an average year. They don't care if it's detrimental as long as you make it out of warranty.

I have 2 2018's that I keep serviced. 5w40 syn diesel oil and a Mopar oil filter every 7500mi. Mopar fuel filters every other oil change at 15k miles. Airfilter every other fuel filter change at 30k. Air filter will vary depending on your conditions you run in.
Aisin trans I change fluid at 36k. Every other fluid dump I'll also change the filter.
Crankcase filter 60k to 65k miles i change that.
Rear axle oil I also change out 36k miles.
I tow some heavy stuff so I stick to what I have listed above. If you never tow you can stretch the miles on rear gear oil and trans fluid. But there's no such thing as over maintenance. I may as well add, you're due for a brake fluid flush too. I try to replace very few years.
 
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crash68

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Around 2017 Ram changed it from 7500 to 15,000mi.
Where does it state this, the 15K miles interval has been that way since at least the '14 model year, probably goes back to the inception of the 6.7
 

18CrewDually

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Where does it state this, the 15K miles interval has been that way since at least the '14 model year, probably goes back to the inception of the 6.7
I'll try to find it. Can't remember exactly what year but IIRC it was during the 6.7.
 

18CrewDually

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Where does it state this, the 15K miles interval has been that way since at least the '14 model year, probably goes back to the inception of the 6.7

My mistake, it was the 6.7 upto 2013 was recommended 7500 miles then they changed it for the 2014+. I made the correction.
 

stevenP

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I dont drive mine very many miles per year, as I use my truck primarily to haul my RV. So I change it basically once a year.
 

06 Dodge

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If your using a full synthetic oil, its a waste to change the oil sooner than 7500 miles or 1 year. Given it's a Cummins going 10K (or more) mile OCI is about on par, there's 3 gallons in that sump. If your changing because it's black, that's just because it's a diesel and no indication of the oil condition.
You'll get a lot of opinions on oil change intervals but if you really want to know, send a sample out to be tested
Have to agree changing it every 5K is a waste of $$$ as good synthetic should be able to go 10K or one year, as for oil samples, IMHO using the Cummins/Fleetguard oil kit is best and they are much cheaper then Blackstone, $16.14 ea ( s/h not included, free s/h on orders over $75.00) when buying direct from Cummins, when in stock...
 

HEMIMANN

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OP - listen to these guys. I worked for Cummins (powertrain engineer), retired in 2016. They know their $hit.
 

Gr8bawana

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If your using a full synthetic oil, its a waste to change the oil sooner than 7500 miles or 1 year. Given it's a Cummins going 10K (or more) mile OCI is about on par, there's 3 gallons in that sump. If your changing because it's black, that's just because it's a diesel and no indication of the oil condition.
You'll get a lot of opinions on oil change intervals but if you really want to know, send a sample out to be tested
Even if you're using plain old conventional dino oil the OCI is 15k miles. The owners manual does not say to change it sooner if using conventional oil. It also does not say to run it longer if using synthetic oil.
 
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