Sorry if this topic is a repeat it was just that I went to a diesel truck mechanic shop and the guy was saying amzoil was king and that the amzoil rep was showing some type of shearing test that only that oil was passing.  I just googled it and found this and it goes back to bringing some reality to the shear test etc. on synthetic and Pennzoil as usual is in the front runners etc etc. 

As they say in the email community feel free to hit delete on that email you do not want to read...  

Stan Galat posted:

motor oil

/mō-tər oil/

n: a viscous liquid no one outside the petroleum industry even remotely understands, but about which strong opinions (bordering on religious fervor) are formed.

See also: cult, holy-war, snake-oil 

Well said Stan!!

Regular motor oil chemically/molecularly breaks down over time, heat, and use.  All motor oils, including synthetics, become contaminated with combustion by-products.  Synthetics are probably less affected by contaminants, but the contaminants build up no matter what oil you use.  Change your oil frequently enough and the particular oil you use, just ain't gonna matter.  Changing your oil is WAY more important to the lubrication and life of your engine that what brand or type you use.

Todd M posted:

Regular motor oil chemically/molecularly breaks down over time, heat, and use.  All motor oils, including synthetics, become contaminated with combustion by-products.  Synthetics are probably less affected by contaminants, but the contaminants build up no matter what oil you use.  Change your oil frequently enough and the particular oil you use, just ain't gonna matter.  Changing your oil is WAY more important to the lubrication and life of your engine that what brand or type you use.

So no zinc required for a flat tappet engine ?  What a relief ! Thank you Todd for this timely confirmation. 

David Stroud Ottawa Canada IM Roadster posted:

So no zinc required for a flat tappet engine ?  What a relief ! Thank you Todd for this timely confirmation. 

Hold on there Tex. Let's not be hasty.

It's probably best to consult a chemistry connoisseur before creating  a conundrum with your car.  All the conflicting condemnations can conflate your cognition if you're not careful. It's best to concentrate on the considerations we find ourselves contemplating.

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