My 35 year old Airhead seems to have an endless lifespan! As I grow older into my 60s now, I figure the old twin will outlast me and then some. Oil in the motor has been all over the place, from auto oil to mc oil and I'm beginning to think it doesn't matter anymore, as this bike has my number in years and will win. My newer GSA gets mc Valvoline and even the old Airhead now too, same oil. KLR too, same oil here

. I keep it simple, all bikes same oil brand

. 380000 now on my Airhead, so it really just likes the oil kept on the full mark, not much else. Randy

