Generally speaking 5k was the normal but you'll see many follow 10k with the 6.7ls when running full synthetic oil. this is HOTLY DEBATED so prepare.... Best case. run the oil to 5k and send to blackstone oil lab and see if they say extend or reduce then go from there etc. My guess is most follow the 5k or 10k rule unless very heavy towing/high idle theyd change earlier or for easy highway miles change later etc.
Stop using the mindset from the 1950's for oil changes. I'd drive it till the system message pops up, then decide my own intervals. Most people will easily go 5k, some run 7.5k, with the final group going to 10k intervals. A VERY small group will go all out with the test reports and run it till the report says to change the oil.
When the truck says it is due, so shall it be. The algorithm is based on 10-30 conventional oil. Or whatever the MC 10-30 is....blend? Anyway, I use a good full synthetic 5-40 so I know it will outperform the standard oil. I've done 6000 between changes and 9000 between them.
I have been using Rotella T6 5W40 but on my next oil change I'm thinking of going to Valvoline Premium Blue Extreme 5W40 because I read somewhere it is also low ash (like Rotella) but will confirm before I buy.
I have read that Chevron Delo is low ash but I have only been able to find it in Delo 600 ADF 15W-40 and Delo 600 ADF 10W-30. I would like to stay with 5W40 and/or full synthetic. My primary interest in Delo is that its website actually says that it reduces ash formation enough to extend the life of the DPF by 2.5 times.
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