I put it in my old motorcycle fuel tank, a year 2000 suzuki intruder vl 1500. It made the engine smoother. I use this to pass my smog test on my 95 nissan pickup. Through a brake booster vaccum line.

I put SeaFoam in my 07 Chevy Silverado 4.8 V8 at 350,000 and it didn't stop the valve rattling. Maybe it's because it doesn't rattle because I have been putting it in 100-200 miles before every oil change since I bought it when it was one year old with 36,000 miles. Thanks Seafoam.

have 160,000 miles on my 2009 toyota avalon. does not leak oil or burn oil, runs fine but want it working in the best environment, cleanest place. should I use an oil additive or leave well enough alone?