viscosity

So, my 2014 r1200 GS and your wethead as well calls for 5W40 oil meeting a whole list of letter and number standards. Castrol had been BMW's recommended provider with a 5W40, but in June BMW signed a deal with Shell. Shell does not list a 5W40, only a 10W40 and up like the majority of brands...

I realize this might become too big to handle, but I've been mulling over the idea of having another round of oils analyzed as it pertains to engine protecting for the Airheads. Obviously everyone's interested in ZDDP, but there are certainly other parameters to consider. My records show that...