Maintenance Matters

December 1998 Issue

The Oil Argument

Straight-weight oils are making a comeback but we think multi-weights are still the better choice.

What is it about oil that makes people crazy?

Historians looking back on the 20th century will probably point to oil, and its effects, as defining our era. So it is in aviation as in the rest of society. Owners, engine shops and manufacturers seem unable to agree on the best oil to use in aircraft engines.

Lately, the debate has focused on so-called straight-weight (often erroneously referred to simply as “mineral”) oils versus the newer multi-weight oils.

Ten years ago, everyone seemed to agree that the higher-priced multi-weights were “better.” Today, there’s growing sentiment that cheaper straight-weight oils may indeed be the better choice, especially from a corrosion c...

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