Originally Posted by gmctd

MMO was very red at one time - I've never used that stuff since I discovered automatic transmission fluid as a viable substitute, back when I was a teenager and couldn't afford the expensive stuff .

I needed something to trickle into the intake of a running gasser to break up the carbon buildup in the upper cylinders - atf worked wonders, and much, much cheaper than mmo.

As atf is not formulated for combustion chamber service, it absolutely does not go into my Diesel fuel tank - and, the seal-softener additives cause the orings in the Inj Pump to soften and swell, destroying their sealing function.

There may be farming country folks on the forum here that can tell you plenty about the penalties involved, so make sure your additive is not red.

Iirc, any and all repeated fuel analysis required by the feds come out of the perp's pocket, whether he chooses to challenge the charges, or not.