Seafoam

Masterbeatty

I used it on my 01' Altima with 190k on it and it ran much smoother. I had a lot of knocking and that went away for a few months but now its back. I dumped a bunch in the intake manifold. and the rest in the tank and it smoked like a sonuvabitch.

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2011 MB 6MT
Masterbeatty journal

DEpointfive0

Try running 91? And maybe run some Seafoam and turn off the engine? (In hopes that it sits on the pistons and cleans them better)

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Masterbeatty

When I drove it cross country last year we ran 93 the whole way from san diego to CT and it loved it. But now since its a beater winter car 87 is all she gets. I just run amsoil fuel cleaner ever month and its pretty good so far. still gets 30 + mpg and starts up everyday.

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2011 MB 6MT
Masterbeatty journal

DEpointfive0

I think you should run higher octane because it will prevent knock, not for any other reason. Good luck

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nis350

Similar experience here with a Honda Prelude, only last a couple a months. I think it does remove some surface carbon, but the thick crusted carbon on the piston top is what caused the knocking.

My mechanic showed me a piston with the crusted carbon. It would take some hard work to scrape off with a screw driver. There is no way that seafoam can remove that.

A better solution is to prevent the carbon buildup by using fuel treatment periodically.

Just my 2 cents.