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Changed mine at 1500 with Valvoline 5-20 and a Bosch filter. I'll run Full Syn. for the life of the beast

Changed mine at 550 miles with Pennzoil Platinum 5w20 and a Bosch filter.

It helped with the HEMI tick big time.

synthetic oil info

ANYONE WANT TO KNOW ABOUT OIL READ THE ABOVE LINK!!

If Amsoil is telling you Mobil One is true synthetic, then you better believe it is, lol. Most high quality synthetics you gonna to have to buy online, they are too expensive for stores to carry. Not enough people understand how much better they are to use in your car or truck.

There is no reason not to use synthetic, unless you change your oil every 6 months without putting many miles on it, then it may not be worth the extra dollars. However, you need to make sure you are using true synthetic group III oil, like Mobil One. The rules are relaxed for group three so many oil companies filter out sulfur and call it group III and they legally can. The carbon molecules in these cheaper oils are not uniformed meaning they will cause more friction then smaller carbon molecules group III oil. There other oils that are more expensive but the difference is negligible from a high quality group III oil.

People with the Cummins should really consider getting a bypass filter and running one of these oils, but for us gas engine guys just mobil one is all your gonna need to use. The reason the Cummins guys should get the best oil is because with a bypass filter on they can get 100,000 miles or more with a single oil change. I've read up extensively on this at Bobistheoilguy.com and TDR. If I didn't sell my Cummins I would have put a bypass filter on it. I bought it and then my knee gave out from all the shifting, getting old SUX! Had to sell it 6 months after I drove it off the showroom floor, but the good news was I sold it for 500 bucks more then I paid for it



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What about synthetic motor oils? Do they need Viscosity Additives?
Group IV (4) and Group V (5) base oil (synthetics) are chemically made from uniform molecules with no paraffin and don't need Viscosity Additives. However, in recent years Group III (3) based oils have been labeled "synthetic" through a legal loophole. These are petroleum based Group II (2) oils that have had the sulfur refined out making them more pure and longer lasting. Group III (3) "synthetic" motor oils must employ Viscosity Additives being petroleum based.

Group V (5) based synthetics are usually not compatible with petroleum or petroleum fuels and have poor seal swell. These are used for air compressors, hydraulics, etc. It's the Group IV (4) PAO based synthetics that make the best motor oils. They are compatible with petroleum based oils and fuels plus they have better seal swell than petroleum. Typically PAO based motor oils use no Viscosity Additives yet pass the multi-grade viscosity requirements as a straight weight! This makes them ideal under a greater temperature range. One advantage of not having to employ Viscosity Improving additives is having a more pure undiluted lubricant that can be loaded with more longevity and performance additives to keep the oil cleaner longer with better mileage/horsepower.

How do I know what motor oil is a Group IV (4) based PAO synthetic motor oil?
As more and more large oil companies switched their "synthetic" motor oils to the less expensive/more profitable Group III (3) base stocks it has become much easier to identify which are PAO based true synthetic. Of the large oil companies, only Mobil 1, as of this writing (12-15-2007), is still a PAO based true synthetic. The rest, including Castrol Syntec, have switched to the cheaper/more profitable Group III (3) petroleum based "synthetic" motor oil
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The words "Mobil 1" and "synthetic" contradict each other so, therfore, should never be used together in the same sentence..... without a period seperating the two.

Hope this helps.

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Grubrunner why not contribute more to the knowledge base then that, perhaps proof or something else along that nature. Amsoil was stating that Mobil 1 was a high quality synthetic, and that is their competitor, lol. I could care less about one company or another, but I would at least like to hear other options for a high quality synthetic oil. If for some reason you don't think Mobil 1 is high quality synthetic then what is? The oil guys at BITOG favorite oil is Penzoil, and Mobil 1 is second.

The Mobil 1 5-20 I just bought says synthetic right on the bottle. For what I paid for each quart, it better be.