Mobil 1 Oil
Looks like Mobil 1 is changing yet again. They used to have "Tri-synthetic". Then they changed to "Supersyn". Now they are offering "Extended Service" Mobil 1. They say it's guaranteed 15,000 miles. I don't know that I would ever want to run ANY kind of oil 15,000 miles, but does anybody have any idea what they are doing? They still have the standard "Supersyn" oil, but they no longer offer the 15W50 in that variety. They DO offer 15W50 in the "Extended Service" variety though. It appears to be about a buck more than the standard Mobil 1. They offer the lighter grades in both "Supersyn" and "Extended Service" variety.
Anybody know what's going on here? Why would they now have two varieties of Mobil 1? If the standard variety isn't good enough, they ought to just replace it totally with the new variety.
I've had good luck with the 15W50 in my Harley.