Jack Legg wrote in
:

http://www.tampabay.com/news/busines...it-yourself-ma
intenance-help-you-save-on-lawn-mower-repairs/1235927

"Spivey recommends using gasoline with an 89 or 93 octane rating, if
you can afford it. The fuel is slicker, which means it won't hang
around on your engine valves and other internal parts, eating away at
the rubber."

Is this true?


89-octane is also known as "Regular". This is the cheapest grade your gas
station sells.
93-octane is also known as "Premium". This is usually the most expensive
grade your station sells.
Usually there's also a mid-grade that's 91-octane.

Next time you fill up, take a look at the stickers on the pump near the
buttons where you select the grade you want. Also, your engine's valves do
not have any rubber on them.

Octane has zero to do with how "slick' the gas is. Rubber-deterioration has
to do with the ETHANOL in the gas. All gasoline engines since about 1975
are rated for up to 10% ethanol. This means that the polymers present in
the fuel system are able to withstand the damaging effects of alcohols up
to a 10% concentration.

--
Tegger