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03-02-2010, 10:56 AM
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#11 |
  
Drives: 08 3DR 5M Bayou Blue; 09 Fos Join Date: Oct 2008
Location: New Hampshire
Posts: 622
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I have been saying this for years. If 20wt was OK, then the newer yaris would be spec'd for it and they are not. Thats not saying 5w-30 GF4 is a good oil. I would be hunting for a 10w-30 SJ or SL outdoor equipment oil for high stress applications. John Deere, Briggs and Stratton and mTD all make good HD oils - dont tlet the lawnmower/tractor bother you - these engine are air cooled usually have NO oil pump or filter and run at wide open throttle mid-high load. 4-stroke marine I/O engine oils are stout too.
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