I added TUNE IT ! VAS-Y oil for a four stroke don't even know it mine is a four stroke . Bought a floor model mower last week with no instruction manuel .I added the oil I bought and started the mower up it smoked like crazy and oil spilled out the side from a hole. Then I noticed beside the hole that it said it just took 10W30W oil. Have a screwed up my mower? The mower is a Yard Machine by MTD or MTO ??
Powermore 140 CC. OHV/SET
Model number 11A AISD500

Karen, May 2016

Checking for tune it! oils, and I find 10W30, 15W40 and 80W90 grades.
The first one is just what you need, the second is a little to thick but correct, especialy under warmer climate, but the last one is MUCH to thick for your use.

Assuming you did not add that oil to the gas, lot of smoke, especialy if it's blue, mean that the pistons segments are deffecive or that you got a brocken gasket.
Oil spilling from a side hole strongly hint a bad/brocken gasket.

My guess is that that engine realy need a qualified mechanic who"ll take it appart, clean it thouroughly, replace any deffective gaskets and re-assemble it correctly.

Electro, May 2016