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10-27-2009 05:49 AM #10
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www.bobistheoilguy.com
I would not run 20W-50 unless you drive it pretty hard all the time. Higher viscosity leads to higher friction and temperatures which reduces viscosity and promotes break down. Chevy recommends 5W-30 for their ZZ502. Also depends somewhat on the clearances the bearings are set-up with. Higher clearance applications will favor the use of higher vidcosity oil in general.
KitzLast edited by kitz; 10-27-2009 at 05:57 AM.
Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400
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I believe this was somewhere around 2015, Rick, Rosie and Johnboy
John Norton aka johnboy