I run Schaeffers 15w40 change about at 10-15k depending on how much towing I'm doing. 20w50 in the puller.
how often do you change it in your pulling truck? I was told on here the other day 7500 was too much? I have been changing mine in the past at 7500-8000 miles and all was fine.
Amsoil 15w40 Heavy Duty / Marine works for me in 6 of the Duramax's I have owned all of them have treated me right with Amsoil.:thumb:
I'm going to switch to the heavier scheafers. Been running the 15-40 7000
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New guy here. Iv narrowed it down to two oil brands that id like use. Im truck is stock & I was told I must use a CJ-4 oil because of the DPF. Now are Mobil 15W-40 Delvac 1300 & Valvoline Premium Blue 15W-40 CJ-4 oils? Id like to use either 1 of these oils if they are ok to use with a DPF.
Good to know. Thanks. :thumb:Either one is fine. Duramax engines are easy on oil, very easy, so use either with confidence.