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I've heard from a number of people that seafoam is just a bunch of water and water-like substances, hence the smoke.
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While it seems true that the smoke would be from water its just not true.
An engine cannot create the temperatures needed to maintain visible water vapor for the 5 feet that seafoam takes to dissipate after exiting the tailpipe. The temperatures you are looking for come from sources such as nuclear power plants.
Some of that smoke you get is the oil that sits in the intake washing out and slowly burning due to the lowered CC temperatures that seafoam creates. (one reason why its so safe!)
Seafoam has a very small percentage of water which is why its so awesome too. Anyone thats ever replaced a blown (coolant side) head gasket would know. That coolant leaking into the CC makes that engine sparkling clean compared to any normal operating engine. That water is super heated and really gets all the carbon deposits out good.
Anyway AutoRX claims this and that...along with some seal leak protection: "Auto-Rx Ongoing Maintenance Plan...For continuous and long-term protection, 3 ounces of Auto-Rx® should be added with each oil change. In addition, you should continue to use non-synthetic oil for maximum benefit."
They got you!! Synthetic oil is the very best slow gentle oil varnish preventative and cleaner. AutoRX tells you to keep adding it because AutoRX somehow creates buildup along the oil seals to keep leaks at bay. Buildup is what were trying to oust! Where else is that buildup occuring?
Anyway, AutoRX says it takes 1500 miles...yeah thats prolly the same amount of time a change to Synthetic oil would take to remove varnish.
Wish I had pictures of all the dipsticks on all the car's I've owned! A dipstick that was discolored due to dino oil varnish, comes completely clean 7,000 miles after changing to synthetic.
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