Main Motorcycle: '74 T140V Chop
Join Date: Jul 2012
Location: Woodbridge, UK
Just been reading some more about this, trying to work out if a 15w-50 would be good as you can easily get Mobil 1 4T 15w-50. It's called racing oil but I'm not sure if that makes a difference. There must be something about it that makes it "racing" compared to normal... Maybe it's just better quality.
Obviously 15w-50 would be identical for the majority of riding, it's just the first 5-10 minutes maybe where you can cause damage...
Although, according to numerous sources such as the following link, the cst minimums for SAE15 and SAE20 are identical. The only thing that differs is the "cranking". As the 15w Mobil 4T stuff is for race bikes, why would they rate that lower on the winter temperature? Surely they crank a lot higher than all other bikes? Why not just leave it at 20W?
Hmmm... I personally think the Mobil 1 4T 15w-50 would be perfect for our bikes. I know millions of people will religiously say stick by the book but if we all had that attitude, nothing new would ever get designed.