[DML] Re: Failed emmissions AGAIN
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[DML] Re: Failed emmissions AGAIN

I agree that the "wrong" octane should not fail you. Theoretically the
higher octane either won't improve the combustion or might even make
the car run worse. In reality (as far as I can tell) the only
difference, besides the obvious price differential, when I use a
higher octane than the car manufacturer recomends the motor seems to
run cooler and I get slightly better mileage. These effects are not
enough to justify the higher price. Using lower octane than
recommended can have serious effects over a long time. I suspect not
as much as in the past because most cars have knock sensors so if the
octane is too low the performance will just be degraded. More
important than octane is leaded vs unleaded. Using leaded gas (if you
can still find it) is a BIG no-no. It will quickly contaminate the
catalytic convertor.
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "Harold McElraft" <hmcelraft@xxxx> wrote:
> There are differences - that's true but, it is a remote possibility 
> that fuel octane is the reason the engine is failing emissions tests. 
> I've run premium for years and mine tested in July 2005 as clean as 

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