Oil Change Procedure - Lycoming YO-233-B2A Maintenance Manual

Before an engine is put in for short-term storage
For engine preservation
To put an engine into service after storage
Before installation of a new or rebuilt engine
To return an overhauled or stored engine to service
After 25 hours of operation after first start-up of any overhauled, rebuilt,
new engine, or engine returned to service after storage
After the first replacement/oil suction screen cleaning
After every 50 hours of operation or every 4 months*
After overhaul of any engine cylinder
*NOTICE: Oil change intervals must not exceed four (4) months regardless of operating
hours and especially if the aircraft has not been flown for at least 25 hours in a
4-month period. More frequent oil changes are recommended if the engine has
been exposed to volcanic ash, particulate, sand, dust debris or extreme weather
conditions.

8. Oil Change Procedure

ENGINE OIL IS FLAMMABLE. OBEY ALL FIRE HAZARD PRECAUTIONS
DURING THE OIL CHANGE PROCEDURE.
NOTICE: An oil sample must be collected during the oil change. The oil change and oil
sample collection must be done within 30 minutes after engine shutdown to get an
accurate sample.
NOTICE: An anti-scuffing oil additive can be added to the oil sump during an oil change.
Refer to "Lubricant Additives" in this chapter.
Operate the engine until the oil temperature stabilizes and then shut down the engine.
A.
Let the engine cool for up to 25 minutes after shutdown.
B.
Drain oil from the engine as follows:
C.
(1) Place a 15-quart capacity container under the drain plug of the oil sump.
(2) Have a clean oil sample vial prepared to collect oil after a few ounces of oil have
drained.
(3) Remove the safety from the oil drain plug.
12-10
Page 62
Table 2
Recommended Engine Oil Change and
Oil Filter Replacement Schedule
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
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February 2021