That could've been down to thermal expansion given the temps you describe and then the metal contracts enough to allow somewhat normal operation again when it cools down a little. Don't forget at 46C you're pretty much halfway to boiling before you start the engine and 1st gear offroad asks a lot from the fan and cooling system. Get oil based on spec requirements (has to meet wet clutch MA or MA2) and temperature and conditions where you live/ ride, not what Bavaria says in the manual. They have no idea if you ride around Siberia in January or Catalunya in August and quite frankly shouldn't specify "weight" in the manual without also providing a table. The F-manual contains a table for reference, surprised the X-manual doesn't.