Originally Posted By: CT8
Originally Posted By: 2015_PSD
Originally Posted By: another Todd
I am sure they are all fine oils, but due to the missing Ford specification I bought Rotella T6 for the next change, replacing the Delo 15w-40 that's in there now. Due to the amount of towing I do, synthetic 5w-40 will probably be all she gets from now on.
I have to admit that T6 was not as smooth as the Kendall that is in there now. The UOA was fine, but I have a few more to try before I weigh all of the options and pick a forever oil which will either be a synthetic or a synblend--shifting into severe duty takes very little with these engines and I do not want to plan that closely.
I find it so interesting how some oil seem to be smoother or quieter than others.I went from what ever came in my new p/u to Pennzoil Platinum [great rebate] and the engine seemed noisy then to Magenetc semi syn and the engine seems quieter and smoother [the seat of the pants dyno is always spot on!!]. P.S. the 5w-40 for your engine seems to cover your use of the vehicle well.
Not scientific by any stretch and I put no faith in it since it "felt" smoother and I have no way to measure that. 5W-40 is a good choice, though I think more so is the synthetic piece and a synblend should fit my needs too. Most of the diesel around me is "up to" 5% biodiesel and when combined with towing or higher temperatures, you slide right into severe duty. Delo is the cheapest of the synthetics so it is a shame it does not meet the specification (which does not mean it will not work).