synthotic oil

Amsoil has a wide range of viscosities and types of high zinc oils to choose from for your engine. I use it in all of my vehicles as well as their Supershift in my race 904 and their Universal Synthetic Fluid in my 2004.5 Dodge diesel dually tow vehicle.

[ame]http://www.amsoil.com/techservicesbulletin/MotorOil/TSB%20MO-2007-08-08%20Flat%20Tappet.pdf[/ame]

Source & additional info: www.thelubepage.com

I've seen idle rpm increases from simply from changing from conventional break-in oil to Amsoil synthetic race oil, engines look good when apart for freshening, there are ET and mpg benefits, trans builder commented that I should keep using what I have in my race trans, synthetics tend to run cooler due to less friction in all applications - engine, trans & rear, synthetics are much more heat resistant, so the provide extra insurance in turbo use as well as in transmissions, where heat is the #1 problem, etc. Cooler water temps were obvious in a '92 Dodge diesel dually that I had. My differential guy likes the reduced wear from Amsoil and I sometimes reuse the bearings.

If an engine leaks or uses oil when changing from conventional to synthetic, it's because it has issues that the synthetics make obvious.

I prefer to use oil with enough zinc blended in from the manufacturer as opposed to adding. But I do add Comp Cams additive to my conventional diesel oil for engine break-in only. I haven't gotten around to trying the new amsoil break-in lube.

Not all synthetics are created equal, so do your research.