I've been using this oil in Speedy since I got it, and have changed the oil every 6000 miles. I had the valve cover off to check valve clearance at 24K, and it looks brand new inside.Mobil 1 15W-50 is also recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required for newer generation vehicles.
BillT said:The way I read their site, Mobil 1 15W-50 is pretty much identical to their 4T 15W-50 Racing oil.
Martin_R said:The recommended oil for 1050 as per manual is 10W40 or 15W50. 15W50 for hot climate, 10W40 for cooler climate.
Nothing odd about Mobil 1 4T, it's easily available at gas stations on the EU side of the pond. Just don't confuse the motorcycle 4T with the plain vanilla car version.
Mobil recommends Mobil1 10-40 for higher mileage vehicles simply because most new vehicles now use 5W-30, 5W-20 or 0W-20. As motors wear, using a higher viscosity oil keeps oil pressure up, so going to a higher viscosity oil is common practice with engines over, say, 75,000 miles.scottzilla said:You know what I don't understand about oil? Everyone seems to ignore the factory recomendations of oil weight. Go to any bike site and it seems everyone admits to using a different weight than what's recommended in their owners manuals.
If a bike is supposed to take 10W40, it seems to me using 15W50 is a bad idea, right? To further confuse things, the oil itself is sold "Odd". The Mobil 1 I saw that was 10W40 was for high mileage vehicles. WTF? ??? The standard Mobil 1 was 15W50 (I think) so a "Responsible" buyer has to make a decision without much info.
I think engineers take oil weight in to consideration when they design engines. It just seems like a critical thing to ignore. And if ignoring the weight is no big deal (As seems to be the case as everyone's engines seem to be fine and dandy), why have weights in the first place?!