There are only a couple of things that set Synthetic apart from regular oil. The most important on is that it will not break down do to heat until temps that would have long ago baked your Dino oil into a solid. The next is that it never thickens like regular oil in the cold. Synthetic will net you some power enhancment alibet minute. If drive properly perhaps 1/2 mpg increase or more.
I've always run Mobil One 20w-50 in the Roadglide since new, because of the temps the oil see's with an aircooled motor. The Silverado has had Pennzoil full synthetic 5w-30 every oil change but one. I put Mobil One Syn in and it absolutely didn't like it, milage tanked, and seals leaked. drained it and put back in Pennzoil and all was well.
Run Wally World 15w-40 in the wifes 300SD. It drips , and burns oil when I put in Rotella 15w-40. She runs it 5 miles each way to work so I change it every 6 months.
In a diesel pickup I'm not sure I would put in Syn unless the payback was from driving long distances regularly. With a llot of short drives and long idles, you should be doing the severe duty service interval and there is just no benefit to using Syn oil.
I will be buying a new to me Dodge Diesel 2500 with 83,000 miles and I'm still undecided what I will run in it.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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