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#1 |
Senior Member
![]() Join Date: Mar 2019
Location: Somonauk IL
Posts: 323
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GL-4 or GL-5 80w90?
Got a sm420 that needs an oil change. I heard that gl-5 80w90 has additives that don’t mesh well with older brass internals of the gears. Is this true?
Any recommendations on the correct oil. Posted via Mobile Device |
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