I really believe in these kerosene based engine flusdh treatments, you know the ones you put in your oil just before a change, drive around for 15 minutes or so, change your oil and it's suppoese to clean out all the sludge and clean the valves and all. I use Gunk's Valve Medic today, the oil had only 2,000 miles on it and was transparent but it was 5 months old, but after I did the flush it was black as crude! I really believe in these things, if the engine is cleaner it will run smoother and cooler and the oil will flow better.

Just putting new oil in the motor makes it run much smoother at high rpm's.

I like using Lucas oil additive but it is so expensive now but it is really good stuff and probably worth it, definitly in the winter.

i used to use Marvels mystersy oil in the fuel for a while but I think it fouls the O2 sensors and throws codes. So now I just use it in the bike.

I've been riding the bike all summer so the car gets very little miles.

What kind of stuff do you all use??