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Originally Posted by MidnightstarS13
This is half true. The other half is that Gunk Engine Flush is petroleum based which can burn your valve seals and crankseals which can be bad overtime. I've used it once and never again. Just an FYI.
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Yep..Gunk Engine Flush is definitely indeed mostly a petroleum based distillate, (about 88-92% additive...check the Material Safety Data Sheet see attached link:
http://www.gunk.com/msds/MF3.PDF
However considering the high revolutions your motor runs at on a daily basis and normal wear & tear on your engine, Gunk Motor Flush burning out your valve seals & crank seals should be the least of your concerns. Gunk Motor Flush is not meant to be left in your engine as part of your oil change...It's meant only for use as a motor flush. It should only be used for about 5 minutes with the engine idling at normal RPM. It's purpose is mostly to wash out all the gunk & sludge that can build up in your oil passages from oil breakdown due to high temperatures. That gunk & sludge can buildup and restrict your oil flow to your oil pump. Insufficient oil flow can cause your motor to spin a bearing on the crankshaft resulting in you having to replace your motor. Using Gunk temporarily as a engine oil/motor flush will not affect the valve seals & crank seals as drastically as one may think. Clogged oil passages will!!
I've got over 135k miles on my motor, and have used Gunk Motor Flush over 38 times with each oil change, (I'm lazy...I average an oil change about every 3500 miles), & have not had any problems using it. To be fair, you can't judge a product on a one-time-use experience. You have to use it several times before you can come to an objective conclusion. If the product were THAT bad, consumer demand, (or lack thereof), would have had the product removed from the market YEARS ago!!
Considering my car/motor has over 155K miles, (I got the car used at 20K miles), I'm more concerned with the crank seals & valve seals failing from daily use/wear & tear than failing from using Gunk Motor Flush. Considering how I abuse my motor on my daily drives, I'm surprised my motor is still running strong. My oil pump or piston rings will probably fail way before my valve seals or crank seals do!!!
But that's my opinion......
ID