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What year 525i? The oil recommendations vary. Not all 525's use the same engine or the same oil.
You can not use the same oil in a engine for manual for a Honda. Each car takes a different type of oil.
Yes, if it is a 4 cycle boat engine. However if the engine is a 2 cycle engine you cannot use automobile 4 cycle oil and must use 2 cycle engine oil.
The same oil as you put in the engine!
Yes.
No you can not use gas engine oil in diesel engine oil because processing of diesel engine is different from gas engine oil. If you use this then it damage your vehicles.
For use as an engine lubricant - no.
If same size engine, yes.If same size engine, yes.
if the oil body is different the sound will change...did you use oil of the same viscosity?
the engine oil to use is 5-w20
NO
If you use the same weight as The original oil, for example now the engine uses 15W-40, and you do an oil change, filling it with the same specs 15W-40 oil that's no problem for the engine.