Oil compatibility tests for Lycoming Engines

Background: Lycoming Engines currently uses VpCI-322 as a corrosion inhibitor in their Test and Preserve oils. They would like to use a different corrosion inhibitor with their oils.

Purpose: Determine compatibility of M-529 with the Test and Preserve oils utilized by Lycoming Engines.

Materials: M-529

Castrol Brayco # 481, MIL-C-6529

Exxon Aviation Oil # 100 MIL-L-6082

FMC Durad # 125

Aeroshell # 65 MIL-L-6082

Method: Standardized Compatibility Test

Procedure: The following samples of oil were created:

After properly mixing the samples, they are thermally cycled. 8 hours in a refrigerated state near 0° C followed with 16 hours at 50° C constitutes one cycle. The samples are periodically examined during testing and cycled 3 times, after which they are removed and a report is written.

Ok = fully miscible and no precipitates

Test Oil, samples A-C

Preserve Oil, samples D-G

Conclusion: M-529 is compatible with the Test and Preserve oil provided by Lycoming Engines.

Project #: 02-164-1325

Estimated Cost of Project: 3 hours

To: Ken Motsinger, Ken Motsinger Associates

For: Lycoming Engines

From: Brian L. Wuertz

Date: 07-29-2002

cc: Boris Miksic

Anna Vignetti

Art Ahlbrecht

Vanessa Schultz

Ashish Gandhi