Excellent Article on Oil...

[farmertom]

When I quit racing, I found that I had a case of Mobil-1 15/50 left over (I think that it was full synthetic). Over the next few years, I used it in my stock '51 with no problems. I had heard that it would leak more, but I never saw any difference.

i remember when i dont recall when amsoil 20w50 showed up read about it in their ads then picked up independent studies i decieded to try it in my 2000 sportster,'03 fatboy,'05 elec glide,'08 dyna,'12 triglide,'16 sporty 48,with those modern seals not too much problem just a very minor seep around the rocker box covers. only a couple of those bikes involved. probably would have happened with conventional. the harley dealer said dont do it then harley a few yrs later pu their name syn 3 for all three holes. Tom.

 

[mfirth]

I know a guy with a 59a engine he rebuilt years ago and ran Mobil 1 from day one. Many years later it still runs strong with VERY LITTLE oil use or leaks.