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[jetenginedoctor]

Originally Posted by barabar

It is about the zink content in oil. There is only about 4 brands of oil out there that fit the bill. Delo 400 15-40 is the best for the money. If you are runing solids and triple valve springs, after break in check the bottom of the lifter to the cam, if it shows any where (that is where the rubber meets the road) you need to change them and up your zink.
Yes synthetic may give you more viscosity at higher heat( 300+) but if you are runing that hot you have other problems.
AF Morrow

Actually, this isn't entirely true.

The API SJ specification did require many oil companies to greatly change the formulation of their oils to reduce the amount of phosphorus because of the concerns of the automobile manufacturers regarding the possibility of phosphorus poisoning the catalytic converters. The makers of petroleum based motor oils had to make more drastic formulation changes than the makers of synthetic oils as synthetic oils rely less on ZDP or ZDDP and other additives to provide the level of wear protection necessary to prevent damage to sliding surfaces within the engine such as flat tappet valve train components.

There is much more to the benefits of synthetic lubricants than being more viscocity stable, better shear resistance, and volitility than refined petroleum based lubricants. Synthetic oils have a tremendously unfair advantage over refined petroleum oils, and the issues discussed here are just the start. Though I'm replacing all the lubricants both in my shop and in my garage at home with Amsoil lubricants, there's nothing at all wrong with the Mobil 1 that I've offered here, and I wouldn't hesitate for a moment to run it in ANY engine. In fact, the only reason I haven't already used this oil is because none of my vehicles require an oil this heavy. I build my engines with clearances suitable for SAE-30 oils, and my Cummins diesel runs Amsoil 10w-40 with 25,000 mile drain intervals. You can't do that with Mobil 1, or I'd just run it in the truck.

Anyway, sorry for the hijack. I'll have more oil up for sale here shortly.

BK