OK so I've got a Sportster also. I've used M1 15w-50 in it for the last 12,000 miles, changing it about every 4-5k with no problems. However I've always thought the cams on mine were a bit on the noisy side. So I'm thinking about trying some of the Schaeffers #132 in with the Mobil. Do you think this would help with the cam noise, if not would it be good/bad for the rest of the engine? What are the advantages and disadvantages of this set up in an air cooled engine. (BTW oil temp usally runs about 180, never got it over 220) How hard are the gear to gear cams and oil pump on oil? And would I need to use it every oil change?
Also the last time I changed my trans/primary oil a friend gave me a quart of the new Syn3 to try. I will admit I can tell a little diffrence in it. The biggest improvement is with the 4th gear whine Sportys seem to have. I saw where another poster tried M1 75w-90 with no problems. Do you think this worth a shot? I always thought Sporty primary oil was a bit thin, and the thicker oil seemed to help, but a $9 a quart it seems a bit high. Just let me know what you think, oh and what do you run in yours? Thanks in advance.
Also the last time I changed my trans/primary oil a friend gave me a quart of the new Syn3 to try. I will admit I can tell a little diffrence in it. The biggest improvement is with the 4th gear whine Sportys seem to have. I saw where another poster tried M1 75w-90 with no problems. Do you think this worth a shot? I always thought Sporty primary oil was a bit thin, and the thicker oil seemed to help, but a $9 a quart it seems a bit high. Just let me know what you think, oh and what do you run in yours? Thanks in advance.