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post #10 of Old 09-30-2019
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Re: Diesel Fuel Treatment: Multiple Questions

Originally Posted by MikeOReilly View Post
Thanks Ö I think . But just to be clear, I really donít know anything about all these snake-oil products. I donít even know if I need to add it to my diesel to over-winter here in the cold. So Iíd be happy to learn more about all this stuff.

SoÖ my cheap STP wonít cut it? Well, too late for this winter, but Iíll gladly look for better stuff next year.
I was just playin' . Chemistry is my thing, and the advertisers do NOT make it easy to discern facts. It is not in their interest. In fact, a few have actively resisted development of industry standards, which tells you something of their character.

I did a bunch of tests, following a draft ASTM procedure, and some worked, and some didn't. A few made it worse.

In fact, I didn't test STP, since it was not a marine store product, so I don't actually know about that one. I do know that Merc Quick Store and Biobor EB are very good with gas and Starbrite and Valvtect are very good for diesel. But formulations change.

I've got a 12-product trial of gas additives running right now. It will be interesting to see if rankings have changed, since some of them reformulated since the last time I tested them.

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