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engine oil
Depends on several factors. Engine type load conditions Type of oil used. Without oil your engine would melt.
520
2-Cycle Engine oil.
standard oil used for the 3.5 High Output engine is 10w40.
We used 30 weight Shell Rotella T oil.
10w30
5w30
Oil is used in any airplane which has an engine of some type. This oil is used to lubricate moving parts (much the same as in a car).
Whatever weight and type the manufacturer recommends.
5w20 or 5w30
10w-30