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Originally Posted by 1930-Pickup
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This is an interesting paper to read. Mostly accurate, although there are some fairly serious typos in there that give incorrect guidance to the reader. Do not follow it blindly. And it's 6 years old, so might be a bit out of date.
For example, do not use 40 weight oil in winter and 20 weight in summer, even though that's what it says on page 11.
That was a brain fart (easy to do on a long paper that you have been staring at for weeks while you write and edit it).
Most guys over think and over worry about oil. The most important things are to make sure you have ENOUGH of it in the engine (but don't overfill) and change it OFTEN. If you do that, your engine will outlive you. And don't over advance the spark or lug the engine; that's really rough on the bearings and NO oil out there will save them.
Besides the typos, there is also a lot of often repeated misinformation in this paper about zinc and ZDDP. Caveat emptor.
Contact the oil manufacturers and get the zinc facts from them, not from an anonymous author on the ahooga.com forum website (or this forum website, for that matter). It is easy to get the facts from the Tech Support hotlines at Shell, Chevron, Mobil, etc. Ask them for the zinc levels in their different oils. I have had spec sheets emailed to me. Very easy. You will discover that they vary by oil type and weight, and intended use. If you choose the right oil, you can get the wear resistance you think you need.
Here is one:
https://cglapps.chevron.com/msdspds/...&docFormat=PDF
Here's another...
https://mobiloil.com/~/media/amer/us...pecs-guide.pdf
Henry had no ZDDP in his Model A oil. Mustang engine owners claim to need high ZDDP, and they may be right, but I don't have a Mustang engine in my Model A, so how is that relevant...
As I said, most guys over think and over worry about oil. Go out and drive your car!
