I enjoy the oil-fuel mix used in Lawnboys for a variety of reasons.
Besides not having to worry about oil leaks, you don't have to
worry about whether other family members are checking oil
level before operating the mower. And, of course, you get more
horsepower per cubic inch of engine with a 2-cycle design.
But, you can still have some "oil leak" situations. One common
problem is a leaking seal on the driveshaft. Oil-gas mixture gets
blown out onto the mower deck. The gas evaporates quickly, but
the oil remains on the deck. This doesn't impact performance
unless it is getting blown onto the drive belt of a self-propelled
mower. A continual fine mist of oil being applied to the drive belt
creates a very slippery and useless belt.
FYI, I've had Lawnboys for a while and I believe that in the past
few years they addressed one of my biggest complaints, which
was locating the exhaust under the mower deck. That made a
much quieter mower, but the heat under the deck was bad for the
grass and it often killed or weakened a circle of grass everytime
the mower was stopped in one spot on the lawn. Plus the mufflers
were not as robust and reliable as other designs and involved a lot
more labor and expense to replace. Current Lawnboy models now
have traditional mufflers.
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One of the many reasons why I still use my old lawnboy.....