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Thread: What kind of oil for a high mileage engine?
          
   
   

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  1. 10-27-2009 06:49 AM #10
    kitz's Avatar
    kitz
    kitz is offline CHR Member
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    check out

    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.

    Kitz
    Last edited by kitz; 10-27-2009 at 06:57 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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