<VV> fuel additives
wrokit at hotmail.com
Thu Jun 24 11:33:51 EDT 2010
> Any opinions or warnings regarding fuel additives such as Lucas or Marvel
> Mystery Oil?
> Currently, my recently acquired 1964 110/4SPD seems to like STA-BIL.
> Any negatives or precautions to combining Lucas or Marvel Mystery oil with the
> Thanks, Tony
Tony- A really good fuel additive is Techron, and works as advertised to clean dirty valves in as little as
one tank of gas. I have had horrible problems with my early turbo going lean on 2,4,6 and going richer
on 1,3,5 - no matter what the engine and carburetor set-up is, no matter how often I boost it, 2,4,6 start
running lean after a few thousand miles, and 1,3,5 will go rich at the same time. Every time I popped the
heads off, the only thing I could ever find wrong was that the intake valves on 2,4,6 were getting carboned
up really bad- kind of frustrating for somebody (like me) that boosts their car everyday to prevent that
very problem! I noticed the plug color difference soon after our local gas station switched from Chevron
to Shell, and found that I could keep the plug colors looking really good (i.e. nearly identical on both sides
of the engine) by adding a bottle of Techron every 2000 miles or so. A few years ago, Shell started advertising
their fuel additive, claiming it would keep valves clean- so I tested their claims when I got my new rebuilt
engine going in 2008. After 2000 miles or so, 2,4,6 started going lean again, 1,3,5 started going rich at the
same time- 2 tanks of techron restored the plug colors. My take on all this is that while the Shell additive
probably works just fine for modern fuel injected cars, it doesnt work for older carbureted air-cooled engines!
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