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FormulaNova said..
Head gasket and oil problem... I think I have lost a lot of respect for you now.
I think you may need to do some more research.
It is a OHV motor, like so many mowers. The head bolts form a U pattern, they aren't a complete circle and the gasket tends to fail in the open bit of the U (not enough compression from the bolts to hold the gasket down presumably).
This then allows compression gases to enter the engine and pressurize the sump. The pressurized sump oil then exits through the breather, into the carb and gets burnt.
Hence no dripping oil, but uses oil. And as the 'failure' tends to happen when the engine heats up the oil gets burnt when the engine is warm and you don't get much / any smoke.
Mower used about 200ml of oil for every 5 litres of petrol. I figure this is too much.
But anyway, it is done, there were signs of gasket failure in the open part of the head bolt pattern, so I assume it is now fixed.
But I don't know for sure, it hasn't been proved in a court of law, so I will trial it by going to mow something and see if there is any oil on the dip-stick when I return (I mean the oil sensor stick thingy, not me)
So DYO research. Lots of videos on Utube about it. Its not up to me to tell you.
(I just realized, I didn't mention it is a Briggs and Stratton motor, hence, yes having no respect for me is actually very reasonable. I would not admitting to owning a Briggs to anyone in actual real life).
How did the world ever produce two people as useless as both Briggs and Stratton. You'd think Stratton would have punched Briggs for producing such **** or Briggs would have refused to work with Stratton if he is happy producing utter crap. Oh yeah, that's right they are Yanks. 'nuff said.