Okay- I used to buy it every 3,000 miles and put it in everyone was telling me that's what I should do it helps the gas mileage. Well I've not bought any ina along time and I was talking about it with a someone and they were saying it's pointless it dies'nt really do anything that it can in a way can cause damage! Dmage to what and how. I have always heard it's good to do and you should do it!??

I used to put STP fuel injector cleaner into my Trooper every 3,000 miles. Saw no ill effects. Ran well until the timing belt broke.

I put BG44K into the X every 8,000-10,000 miles. Seeing no ill effects. Is it helping? I'll let you know at 200,000 miles (87,xxx now).

Buy a gallon of denatured alcohol and put 12 ounces in before you fill the tank. That will clean out a bunch of crap, plus it works as a great octane booster.

Run whatever injector/cleaner through on the tank before you change the oil. Good interval, and you won't have the potential of whatever amount of it that gets into the oil staying in there and potentially causing problems.

Good call! That reminds me.. I need to change my oil.