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Honda recommends 10w30 SJ or higher engine oil. The new Honda Power Equipment oil is 10w30 SN. I am concerned that SN (low zinc) oil may not protect my new OHV engine. The mower is used in hot, humid, South Louisiana. Any thoughts or recommendations would be appreciated.

B&S 725ex 190 cc made 3/2013. Engines starts 1st crank, misfires and surges until hot My snapper with B&S 725ex, 190cc, L Head engine, made 03/2013 starts easily then runs rough until hot. After engine is warm it begins to smooth out gradually. Same symptoms since 1st start in 2013. Multiple...