Certainly regular changing of oil is the most important, but curious if anyone has used a product like Slick 50 for a significant amount of time with measurable benefits.

In 1991, I had an 88 Subaru Justy that I put Slick 50 in, and although I don't know if my 8 months of use was statistically significant, I did notice a MUCH smoother running engine. Didn't think to measure an mpg difference or the like, but I was VERY skeptical of products like this, and must say I was pleasantly surprised.

I don't know that I will plan on adding anything to my Hybrid, but thought someone may have good reasons on WHY TO USE or WHY NOT TO USE ONE.

In this poll, remember, this is just ADDING something. I am not asking whether you'd extend oil change intervals or use a different type of oil than you normally would.