Worry. That's not good. Suggest you find out why before before running the engine again. Could be simple like bad seal on intake gaskets or head gaskets. Could be cracked block or heads.
It should not be.
Briggs and stratton engines use different oils depending on the temperature to which the engines will be used. Generally sae30 oil should be used for mower engines
All engines use a little oil, even new ones. As they wear with use, their oil consumption will increase. Should it get to the point were the exhaust is permanently smokey or consumption is high,maybe a litre every 1000kph, its time to do something about it.
if the timing chain and tensioners are worn out the chain will wear a hole in the timing cover and the oil will get into the water jacket and the antifreeze will get into the oil high time to fix it
Fix your tankers, not enrich your bankers. If you spill...You will KILL! Oil and water don't mix. Oil is for engines, not fish. Our fish don't need your oil. Keep water out of your crankcase, and oil out of the ocean.
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Look in the owners manual if you have it and see what the rating on the oil should be. I think most air cooled engines require a SG or SJ rating but I'm not sure. Air cooled engines run at higher temp than water cooled engines so, although automotive oils will work, if you're looking for long term service the proper rating will be best. Another thing you should do is run the engine at full throttle to keep the fan turning faster to cool the engine.
Motorcycle engines have a site glass located on the side of the engines. The oil should run between 1/2 to 3/4 covering it. Some also have a dipstick to check the oil level with.
You should change your oil in your new truck every three thousand miles at least. You should check your oil once in a while. If its a new truck check oil every month.
High oil pressure is not usually a problem. The relief will open around 100psi on most engines.
Castrol 20/50, best oil for small hi rev engines.