If you believe your engine needs more engine cleaning additives that that required in all gasolines, there's a cheaper way to get it than paying ten to twenty cents more per gallon for medium and high grade gasoline.
You can add a bottle of gas treatment containing polyether amine [PEA] every $7500 miles.
The leading brand containing PEA is Techron Fuel System Cleaner, but PEA is beginning to show up in other brands, such as Mighty VS-7, which should work just as well.
Here's a recommendation for it at a BMW board:
You should clean your BMW's fuel system every 7500 miles
with Chevron's Techron additive. The reason I use Techron over the
multitude of other fuel system cleaners is because Techron is the only
fuel system cleaner that I've seen that's been consistently recommended
by mechanics. The other fuel system cleaners may or may not work, but
I've heard only good things about Techron.
Motor Trend
Magazine recommends Techcron for those sensing a loss of power and performance:
If the loss of power and performance is due to combustion chamber
deposits buildup..."the current state of the art treatment is an
addative called polyether amine (PEA). Developed by Chevron and
originally introduced in 1980, today it carries the company trade name
TECHRON®."
Pour the additive into the tank before filling up with regular (unless the manufacturer specifies a higher-octane gas).
Now that ACE's 2002 Sierra Denali pickup (with 6L engine -- new ones have 6.2L) is crossing 50K miles, he'll probably start adding a bottle every 7500-10,000 miles, even though the engine seems to be running as good as ever, and keep buying a good brand of regular.
Some cautions in the continuation
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