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OIL SYSTEM.
The engine oil level should be checked before each flight and changed as specified in Chapter 5. During oil change the oil screen(s) should be removed and cleaned, and the oil filter cartridge replaced.
— Note —
Lycoming recommends changing the oil and filter each 50 hours or every four months, whichever comes first.
— CAUTION —
DO NOT INTRODUCE ANY TRADE ADDITIVE TO THE BASIC LUBRICANT EXCEPT AS RECOMMENDED BY THE MANUFACTURER IN THE LATEST REVISION OF LYCOMING SERVICE BULLETIN NO. 446.
— Note —
Add one six ounce can of LW-16702 to the engine oil every 50 hours or at each oil change in accordance with the latest revision of Lycoming Service Bulletin No. 446.
The engine manufacturer does not recommend oils by brand names.  Use a quality brand Aviation Grade oil of the proper season viscosity.
12-10-00 Page 12-10 Revised: February 28, 2002
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DRAINING OIL SUMP.
To drain the oil sump, provide a suitable container with a minimum capacity of that required to fill the sump. Remove the upper cowl, on the inboard lower side of each engine an oil quick drain is provided.  To drain oil place a tube of the proper diameter on the quick drain and push into drain. After completion of draining remove tube and check to make sure that quick drain has properly sealed.  It is recommended the engine be warmed to operating temperature to insure complete draining of the old oil.
FILLING OIL SUMP.
The oil sump should normally be filled with oil to the mark on the engine dipstick.  The specified grade of oil may be found in the Lubrication Chart, or on the cowl panel access door of each engine.  To service the engine with oil, open the access door of the cowl and remove the oil filler cap.
OIL SCREEN (SUCTION ).
The oil suction screen is located on the bottom aft end of the engine sump, installed horizontally.  to remove, cut the safety wire and remove the hex head plug.  The screen should be cleaned at each oil change to remove any accumulation of sludge and to examine for metal filings or chips,.  If metal particles are found in the screen, the engine should be examined for internal damage.  After cleaning and inspection, place the screen inside the recess in the hex head plug to eliminate possible damage to the screen.  Insert the screen into the housing and when certain that the screen is properly seated, tighten and  safety the plug with MS-20995-C41 safety wire.
RECOMMENDATIONS FOR CHANGING OIL.
Refer to latest revision of Lycoming Service Instruction No. 1014 and Service Bulletins No. 446 and 480.
1.
In engines that have been operating on straight mineral oil for several hundred hours, a change to ashless dispersant oil should be made with a degree of caution, since the cleaning action of some ashless dispersant oils will tend to loosen sludge deposits and cause plugged oil passages. When an engine has been operating on straight mineral oil and is known to be in excessively dirty condition, the switch to ashless dispersant oil should be deferred until after the engine is overhauled.

2.
When changing from straight mineral oil to ashless dispersant oil, the following precautionary steps should be taken:

a.  
Except when using LW-16702 (Lycoming Service Bulletin No. 446) do not add ashless dispersant to straight mineral oil. Drain the straight mineral oil from the engine and fill with ashless dispersant.

b. 
   Do not operate the engine longer than five hours before the first oil change.

c.  
Check all oil screens for evidence of sludge or plugging and change oil every ten hours if sludge conditions are evident.  Repeat 10 hour checks until clean screen is noted, then change oil at recommended time intervals.

— Note —
Add one six ounce can of LW-16702 to the engine oil every 50 hours or at each oil change in accordance with the latest revision of Lycoming Service Bulletin No. 446.
12-10-00 Page 12-11 Revised: February 28, 2002
OIL FILTER (FULL FLOW).
1.
The oil filter should be replaced after each 50 hours of engine operation; this is accomplished by removing the lockwire from the bolt head at the end of the filter housing, loosening the bolt, and removing the filter assembly from the adapter.

2.
Before discarding the throw away filter, remove the element for inspection by using Champion cutter tool CT-470.  Available from Champion Spark Plug Co., Toledo, Ohio  43601. It will cut open any spin-on type oil filter for inspection.  Examine the material trapped in the filter for evidence of internal engine damage such as chips or particles from bearings. In new or newly overhauled engines, some small particles of metallic shavings might be found; these are generally of no consequence and should not be confused with particles produced by impacting, abrasion or pressure.  Evidence of internal engine damage found in the oil filter justifies further examination to determine the cause.
　
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