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      12-16-2013, 04:31 PM   #17
Quasimodem
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Drives: 335d
Join Date: Oct 2008
Location: California

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2009 335d US  [0.00]
I used a diesel additive (I think it was Amsoil, but I will edit this later when I have a chance to check my garage for which one I was using) for a few months in the proportion specified on the bottle.

I started noticing a slight "thump" when I started my car. Sounded sort of like a mild backfire.

I got lazy, and stopped using the additive. Starting thump/backfire went away.

Edit: It was Power Service Diesel Kleen with Cetane Boost. And it took a while after stopping using it for the initial backfire to go away. This tells me that it might be okay to use it once in a while to clean out the engine, but I wouldn't use it on every tank of diesel.
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Last edited by Quasimodem; 12-17-2013 at 01:48 AM.
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