Ran another brand of oil in my 250r for years but that oil is no longer available....tried a few other kinds and started having problems immediately with plug fouling and engine loading up. Old oil I ran for twenty five years with no such problems. I did some research and determined that the klotz that I had switched to, was not formulated for lower rpm riding. Most all of my riding is in the woods and very aggressive with some engine-testing hill climbs, however, there are some periods of low rpm riding. I studied on it and settled on maxima super m and after four or five days of hard riding, I think I'm back to riding without frustrations of plug fouling. Noticeably less smoking also, I might add. Time will tell if the maxima super m holds up to my testing but as of now I think I've found the best oil available for woods riding.
When I bought my 2009 CRF 450R used the guy gave me this oil, but I had never heard of the brand. Once I used it up I went to the Honda oil but then switched back because my mechanic that has been riding since he was a 3year old said this is about the best you can get. I switched back. Less wear and tear!
I've used Torco oil exclusively in my 1975 860 Ducati from the time it was purchased new to today. It is still running strong four decades later. Around 42K I installed bigger bore higher compression pistons for a little more punch. I was delighted to see that the original pistons looked virtually brand new when removed! With well over 50K miles its still getting around with the original bearings and internals. A very satisfied user of Torco oils.