Special Tools and Supplies
Teledyne Continental Motors, Inc.
TM
3-34
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
3-2.2. Oil Change Intervals
Refer to the engine maintenance manual and/or the aircraft manufacturers or
Supplemental Type Certificate (STC) holders AFM/POH for fuel specifications, specified
oil change intervals and inspection procedures.
The oil change intervals published in this manual are minimum requirements. Teledyne
Continental Motors believes more frequent oil and filter changes enhance engine service
life. TCM recommends engine oil be drained and replenished every 25 hours of operation
or 4 months for engines that incorporate an oil screen. Engines with full flow oil filters,
either large or small, should have the oil changed every 50 hours or 4 months.
NOTE: When using the small (4.80 inch high oil filter) do not
exceed 50 hours and/or 6 months between oil and filter changes.
When using the larger (5.80 inch high oil filter) do not exceed 100
hours and/or 6 months between oil and filter changes. Oil screens
and oil filter elements must be inspected for contaminates at each
oil change. Oil analysis may be used in addition to the oil screen or
filter element inspection, but not as a replacement for it.
3-2.3. Additives
There are many fuel and oil additives and/or concentrates on the market today which
were formulated primarily for automotive and industrial engine applications. From time
to time, we receive inquiries regarding use of these products in our aircraft engines. Most
of these additives and concentrates, while they may be highly beneficial to automotive
and industrial operation, are not compatible with air-cooled, light aircraft engines in their
operating environments. With the exception of the use of isopropyl alcohol and ethylene
glycol monomethyl ether compound described in the following paragraph, we do not
recommend the use of additives or concentrates in any of our aircraft engines. In fact, the
use of such additives may void the warranty. Use only recommended fuels and lubricants.
WARNING
Mixing of the DEGMME compound with fuel concentration in
excess of the recommended (0.15 percent volume maximum)
could have a harmful effect on engine components. Use only
the manufacturer’s recommended blending equipment and
procedures to achieve proper proportioning.
Under certain ambient conditions of temperature and humidity, sufficient quantities of
water may exist in the fuel to create restrictive ice formation in the fuel supply. To
alleviate this occurrence, it is permitted to add no more than three percent Isopropyl
Alcohol to the fuel supply. Also, Diethylene Glycol Monomethyl Ether (DEGMME)
conforming to military specification MIL-DTL-85470B, if approved by the aircraft
manufacturer, may be added for this purpose. The DEGMME compound must be
carefully mixed with the fuel in concentrations not to exceed 0.15 percent by volume.
