If you live in the Southern parts of OZ, LPG is fine in the 300E because it
is mostly Propane with a high octane level about 100+ (goos as any racing
fuel!). If, however, you live in warmer places like Queensland, forget it.
Up here, the companies flog off Butane blends, lower octane (about 90 or
less) because our nights never go below 0 degrees C. If Butane goes below
zero C. in the Southern states, it won't boil (pressurise) and there won't
be any pressure to start the engine, so the companies must supply Propane
(boiling point -42 deg. C.).
Unfortunately, there are no regulations in Australia regarding LPG Propane
content as there are in most other countries (including the US). The
biggest problem is tuning. One tank full might be mostly Butane (like
base-standard petrol) and another might be Propane. The engine's electronic
control unit has to work hard to re-learn the different fuel characteristics
and, by the time all is running well, we dump in a different batch of
unfamiliar stuff! A similar problem occurs between petrol fills and LPG
fills. Stay with LPG as often as possible.
Don't worry about the stories of burning-out exhaust valves. Happened
mostly with the old cast-iron heads without valve seat inserts (porous cast
iron poor at removing valve-head heat - The lead in the older fuels filled
in the porous holes).
Bottom line - If you live in a place which goes below zero C., and intend to
stay there, go for it. If you live North of Sydney, be prepared for erattic
performance from fill to fill.
Hope this has been helpful..
LPG educator (TAFE) since 1977.
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