I have a honda civic 2001, with 224,000 miles(high milage..My car was picking up rough in speed. I was going to go with lucas, but was told this works better, I thought that it wouldnt make a differance really, only in my pocket. But I went ahead and got this, and I added half in my gas tank and half in my crankcase(engine oil) I drove my car after adding seafoam for 100 miles, to allow seafoam to work through engine. while driving I could feel the seafoam working, after I reached 100 miles, it was time to change the oil( change oil once you reach 100 miles) when I changed my oil, the oil poured out black. I did my oil change with vavoline maxlife hm 5w30 and K&N oil filter. once the old oil was out along with the seafoam that was added to it..I test drove it for a couple of miles..wowow..I couldnt believe this little bottle did the trick. I didnt feel any rough pick up when driving, it smoothly went into each gear without me pressing hard on the pedal to pick up speed. I will be using this on a reg. bases every 3,000 miles( 100 mile before oil change) and next time I will do it the way most people use it,which is 1/3 in gas tank, 1/3 in crankcase(oil) and 1/3 in vacuum line hose (I wasnt able to do the vacuum line this time and so I did it 50/50 in oil and gas tank but still is better to treat all 3 at 1/3 of bottle for each area being treated(gas tank,engine oil,vacuum hose line) which is roughly about 5.1oz for each treatment area.
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