When I was replacing my valve cover gaskets, it was very clear that there was
considerable sludge and buildup on the valve train. This is probably indicative of the
entire motor. I started looking more closely at all these "miracle" engine additives. I
settled on a particular product whose claims were mostly about "cleaning" this type of
sludge and buildup inside an engine.
With great difficulty, I parted with the 35 bucks
for their kit. Included was a quart of oil additive, a pint of fuel additive and a pint
of transmission additive. I decided that I would just use the oil additive and see what
happens. After running this additive for a thousand miles, I removed one valve cover to
inspect the area for differences. Did they say miraculous? It was. The areas that were
previously covered in black sludge now looked almost as clean as a new engine. I am
convinced.
My opinion, in summary, is buy fuel that your car runs well on and gives good mileage,
use good oil, even a specially formulated high-mileage oil if your car qualifies, add
lead if your car is old enough to need it, and you might even want to try one of these
"miracle" additives if it looks like you might benefit from it. Try some of these simple
tests yourself, and use the products that work best for your car. 
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"Buy fuel that your car runs well on and gives good mileage, use good oil and add lead if your car needs it. "
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