I'm late to the game here obviously, but I might as well chime in.
My 14 HP uses oil pretty heavily too. It's def. a hybrid, or a 60/40 engine. (60% gas, 40% oil.) I run 30wt in the summer months and 10w 30 in the winter. It's still got power so I'm gonna keep dumping oil in it and run it till I either blow it up or deem it's smoking too bad it needs a rebuild. We rebuilt my dads 12 HP in about 2002-03 and it's still running/driving strong. (course we used genuine Kohler parts...)
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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