The engine in the BMW GS 1100, 1150 and 1200 is air cooled. This means that the engine manufactoring process works to larger tolerances than modern water cooled engines.
Therefore by definition a brand new boxer engine has the same tolerances as an older water cooled engine with some milage on it.
Therefore the best possible engine oil for your BMW GS or BMW boxer engine, regardless of its age or milage is Castrol 20W-50 High Mileage.
Also note that this is not a synthetic oil. For African travel stick to regular mineral oils which are available all over the continent.
Synthetic oils with a rating of 5w-30/40 are for high stress and fine tolerances and are completely inappropiate for the air cooled boxer motor.
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