OGOBRacing
New member
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. Now I assumed the engineers chose the lower viscosity for a reason, but if only because of the Castrol deal it opens up a lot more possibilities. We all have our favorite oils and the argument of what is best will never end. I've long been partial to Mobile 1, having run it in my race bikes and street bikes with never any lubrication related issue. I might dump it in the GS.