Thanks in advance.
My truck just turned 600k
I was wondering if I should get a thicker oil 15-40
I’m using delvac
Also oil change should be done at 35k on 3000 miles a week ?
That’s what Cummins recommend ( i think is way too much) Should I do 20-25-30k miles .?? I’m confused. I know people doing it every 10k but everything is too expensive right now
Truck is deleted so no egr.!
Cummins oil change intervals and oil recommendation at 600k miles
Discussion in 'Experienced Truckers' Advice' started by Xenergiserx, Jun 20, 2022.
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I’d stay with recommended weight/viscosity, shorten up the interval maybe. Especially if it burns a second added gallon quicker than the first, between changes. No scientific evidence here. Just that worn oil seems to burn faster, as it loses viscosity. I usually change mine, a gallon low. Keeping it topped to the low mark, when close to oil change time. Doesn’t hurt it. Using the gallon towards the oil change. Helps with cost. Have to be careful, don’t want to get too low. I’ve went 2 gallons low often, on an older engine. Watching oil pressure. Since the added oil seems to burn up quickly. Then change ASAP. Old worn out engine on its last leg, I’d go up to 15-40, even add some Lucas. That’s old superstition, they say. May not apply to newer tighter tolerance engines. Exactly why I’d stick with original recommended oil now. Thicker’s not always better with new engines, from what I’ve heard. My old Detroit’s had 50% Diesel in the oil, from a bad injector, and excessive Lucas used towards the end. Only thing affected was the amount of oil leaking, and some eventual sludge built up on the rockers. I think the newer engines aren’t as forgiving. I’d go by the book. My old Cat used to burn a gallon between oil changes once it hit 600k. That was at 12k intervals. Over time, oil usage would increase, as it got closer to 1 mil miles, typically adding a gallon, and being low a gallon again, using 2 gallons, then changing it. That all was considered normal oil usage for the miles on the engine. It was cost effective to not add the second gallon, instead just change it. Since added oil would just burn up quickly anyway. Keeping it changed was better for the engine, and discourage increased oil usage. That’s why I still believe it applies to even newer engines. Though tolerances and intervals have changed. The basics still apply. Oil pressure, and amount used between changes tells a lot about the amount of wear on engine. All these Fleet oil programs, extending changes, changing filters only, adding clean oil etc. Seem like a gamble. The fact that oil samples must be included in these programs to justify warranties proves it to me. Just change it, cheap insurance as they say.
Last edited: Jun 21, 2022
unloader, JolliRoger, 88228822 and 5 others Thank this. -
That’s straight from Rawze the Cummins guru.
Diesel Dave, baha, Xenergiserx and 4 others Thank this. -
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Werner used to change oil based on hours, not miles. I can’t remember the set number. That was 30 yrs ago. 11.1 and 12.7 Detroit engines. They always made good reliable O/O Trucks, purchased at a decent price, through their Highway Sales used Dealer. In 1996, I could have bought a 95 Condo from them, 12.7/10 spd. Truck had 305k, been Team Driven. $53k. Instead I bought a 92 WS with 500k mikes for $40k. It was a nice Truck at a good price. Should have bought the Condo. Newer, better mpg and lower miles. I’m sure I’d made more money with it. But nooooo, had to have that pretty WS, with the 5.2 mpg 425 Cat.
truckdriver31 and Xenergiserx Thank this. -
Oil sample and see what it say to change. I've gone 100k miles before draining oil. I would just change my bypass filter and my engine oil filter every other service. Honestly with today's technology there really isn't a need to keep draining oil and wasting money...
truckdriver31 Thanks this. -
lester, olddog_newtricks, truckdriver31 and 3 others Thank this.
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8000 miles?
what a waste of oil.
try 18,000 miles with a OA.truckdriver31 Thanks this. -
truckdriver31, Accidental Trucker, thaistick and 3 others Thank this.
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Hours not miles. I would research the numbers and change the oil/filters at that interval. And dropping in a gallon of Lucas oil treatment won’t hurt.
truckdriver31 Thanks this.
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