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Message: [QUOTE="97cherokee, post: 1551836, member: 22488"] ive been running rotella 5w40 in my 7.3 for the past 150k truck has 375 on it now and runs like a champ, i run the t5 10w30 in my 6.7 and it does well. not sure why rotella catches ****??? pretty much all of the diesel oils went down hill when the new ck-4 classification came out in 2017/2018. and i did research when i bought the 6.7 as too why ford didnt certify most ck-4 oils and if i remeber correct most lack zinc/phosphorous and a few other additives ( thanks epa) [/QUOTE]

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