HMR
Registered user
buzz said:Hi
My dealer told me to use 10 w 40 oil.![]()
Your dealer is incompetent.
Read the User's Manual. There you can find that the BMW boxer requires 50-oil when the temperature exceeds 20 centigrades.
5W50, 10W50, 20W50 will all do fine.
Mineral oil is OK but synthetic is better. If you change oil often the cheaper mineral oils are more economical. Best quality for the price you will get if you buy the HD Diesel engine oil that is used in construction machinery. Try the shops where farmers buy equipment.

of oil whatsoever, even my lawnmower !! 

