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30 weight
10 W 40
When we did weight and balance on the small piston engine aircraft I trained on we always used 9lb per U.S. gallon
Small engines....like lawn mowers, compressors, etc typically take a 30 or 40 weight oil. Also, it used to be recommended to break in a new engine with a single weight motor oil.
It they are the same weight oil as in SAE 30 weight oil there is no difference and they are identical. 30 weight oil is 30 weight oil synthetic or conventional.
Most small engines use 30 weight non-detergent type.
weight of oil is lighter than water
Depends on the year but most use SAE 10w30.
The quick answer is probably not. If you are worried, change it to the proper oil, and save the drained oil for the small engines. Small engine oil is usually non-detergent. Detergents help the oil wash off the engine parts. Small engines are usually only used during part of a year, such as in lawn mowers and wood chippers. There, you would want the oil to leave a film on the parts to help prevent rust while the engines are not in service. The other difference would be the viscosity (how thick the oil is). the small engine oil might be thicker. Small engines usually use a staight-weight oil (like SAE 30) where car engines use multi-weight oils (like 10W30). I used to use straight weight oil (SAE 30) in my car until one extremely cold day when the oil became so thick that it wouldn't suck up the pick-up tube, and the oil light wouldn't turn off. I quickly shut off the engine, changed the oil to 10W30, and never used straight-weight oil again. When I sold that car it was 15 years old and the new owner said the engine still sounded like new. So, the engine was not damaged.
Just the opposite, 30 weight oil is thinner that 40 weight oil and will flow better at low temperatures.
It is the weight of the multi-vicosity oil. The 10 is the weight of the oil when cold. The W stands for Winter. The 40 is the weight of the oil when it gets hot.
SAE 10 weight oil