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      12-16-2013, 05:31 PM   #17
Quasimodem's Avatar

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.
Speakers: CDT Audio HD-42 comps--front doors (RAAMmat deadened), CDT ES-06 6.5" woofers--kickpanl Pods, Hertz EBX202R dual 8" ported trunk sub. Amps: Phoenix Gold RSd 500.4 (comps & pods). PG RSd 600.1 (sub). Power & Ground: 4AWG Streetwires w/RockFosgt RFDB1 distro blocks. Input: HU lineout--Kicker KISL RCA adapters--RockFosgt RFIT-6 cables--Audiocontrol Matrix--Monster cables--RSd 500.4--lineout Monstr Cabl to RSd 600.1.

Last edited by Quasimodem; 12-17-2013 at 02:48 AM.