Ultralight Aircraft pilots flying
on two stroke engines should be aware that their are different oil
recommendations for the two different styles of Rotax two stroke
engines used in aircraft application.
There is one OIL FOR AIR-COOLED ENGINES.
Air cooled engines run hotter than water
cooled outboard-type engines and require a lubricant formulated
for their unique lubrication requirements.
Outboard oils have a
lower flashing point and tend to burn up early in air-cooled
engines, causing carbonization and eventual ring sticking.
of this, BIA, TC-W and TC-WII oils can promote the formation of
Rotax recommends the use of a 2-cycle oil for air cooled
the optimum oil in most of their owner's manuals (all but the
This includes the 277/377/447/ 503 air cooled engines PLUS the 532
and 582 liquid cooled engines.
These liquid cooled engines run the
same high internal temperatures as the air-cooled smaller engines
and require the same high-temperature type of oil.
These oils are NOT compatible
with TC-W or TC-WII lubricants.
DO NOT MIX THE TWO DIFFERENT OILS IN YOUR SYSTEM
OR GELLING MIGHT OCCUR.
recommendation for mixing ratios. For the 618 Rotax aircraft
engine two stroke Water cooled engine oil is recommended sue to
internal temperatures. With a lower flash point, this oil is
perfect for engines such as the 618 which run similar temperatures
to those of an outboard type engine.
There are also two different formulations one for pre mix
and one for oil injection!
For further information on an oil test click here!
CAUTION: DO NOT MIX WITH 2-CYCLE AIR COOLED
WITH TWO STROKE WATER COOLED OILS
OR IT MAY GEL IN YOUR LINES.
Drain all oil out if you ever
change oil types.