Originally Posted by showkey
Not always true..........when this came up prior it was found that 15w-50 Mobil 1 had friction modifiers as per Mobil tech support and not suitable for wet clutches.
Ive run this oil for about 10,000 miles now, in a high HP '10 TE450 Husky, with zero clutch slipping. I've outrun the newer 511 in a drag race. I run this oil in my Versys with no clutch slipping. When the new 5w50 synthetics come out, I will be running those, if they are $5 a quart.