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Yeap! I ran a few rounds of rotella synthetic 5w-40 thru last summer, LOVED it, didn't have any issues, oil pressure was great, and the truck idled smooth.
I currently have 153k, and I ran Rotella from 139k to 147k, two rounds of 3k miles and some change - I started using it to get rid of the faint tick that developed at 139k.
It worked as far as I can tell - no more ticking.
The rotella is a diesel/gasoline rated oil with a higher detergent level then regular gasoline engine oil.
I switched back to a lighter oil for winter, 5w-30 Havoline blend, I was due for a change and couldn't find the Rotella for a few weeks.
Couldn't say whether or not the 3.2L is prone to sludge, and mine doesn't use more then 1/8 qt in 3k miles; I didn't go to a heavier weight because of useage, but because it (the Rotella) contained more detergents and I do a LOT of heavy mountain driving.
I don't know yet, for sure, if I'll run the rotella 5w-40 this summer, or switch to the 10w-30 Havoline blend.
I want to run a used oil analysis on the Havoline blend that I now have almost 3k on to get an inside view on whether or not the truck likes this oil.
I had used Havoline regular 10w-30 oil for the first 139k on this truck, with no issues at 3k mile oil/filter changes.
FWIW - I will stick to either 5w-40 or 10w-30 for summer use, and definitely switch back to the 5w-30 Havoline blend next winter.
In my opinion, from what I've experienced, I don't see the need for a true synthetic, i.e. Mobil 1, etc unless you are going to extend your oil changes past 5-6k, which is not advisable on these 3.2L engines, they like real clean oil.
Even with the Rotella synthetic (not a true synthetic BTW), I'll only extend it out to 4-4,500 miles. Same with the Havoline blend.
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