Posted by DelMN on February 14, 2014 at 11:17:53 from (74.44.209.55):
I found this on another website, it may be helpful: BOTTOM LINE: Running an old engine without zinc in the oil is bad news-- especially when breaking in a fresh build. Ask around and you'll hear about high rates of camshafts going flat. Avoid the problem by choosing the right oil-- that has a zinc content of at least .11%. If you're running zero zinc content oil in an old engine, I believe you're asking for trouble.
I've done some research. Here is the zinc content of todays oils:
20W-50 AMSOIL (old) none AMSOIL (new) none Castrol GTX .12 Exxon High Performance .11 Havoline Formula 3 none Kendall GT-1 .16 Pennzoil GT Perf. none Quaker State Dlx. none Red Line none Shell Truck Guard .15 Spectro Golden 4 .15 Spectro Golden M.G. .13 Unocal .12 Valvoline All Climate .11 Valvoline Turbo .13 Valvoline Race .20 Valvoline Synthetic .12
20W-40 AMSOIL none Castrol Multi-Grade .12 Quaker State none
15W-50 Chevron .11 Mobil 1 none Mystic JT8 .15 Red Line none
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