I'm starting to do my own services on my 2000 model R1100R and have recently put more thought into the type of engine oil i should be using. I bought the bike with 60k on the clock and have done 20k in the past 3 years on Shell Advance 4T (15w-50) oil and the bike runs really well (this is the oil the mechanic had been using). I bought a 4 ltr bottle of this oil the other day and noticed that it is a mineral oil with a sticker on the bottle saying it has a synthetic additive. I phoned BMW and they recommend using Castrol Activ 4T (15w-50). My bike isn't subjected to regular cold starts (in that i don't use the bike to commute and only use it for long rides in the country and it's always garaged
). I live in Melbourne, Australia, and the air temperature range the bike is exposed to is between 12-40 degrees celsius. If anyone could please enlighten me as to the difference between these two oils I would be most appreciative (or perhaps even recommend a better one to use). Also, which website have members found to be the best for ordering BMW parts from?Thanks
Adam