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Importance of a good seal on the alternate air door

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Some years ago I got a spike in silicon and copper in oil analysis. It was posted here in various threads related to oil analysis. It turned out to be a little gap, about 3mm, in the alternate air door, allowing soil ingestion (the silicon) and causing excess wear of soft metals (copper and others).

Quite funny to get one of Savvy’s business promotion circulars mentioning exactly this problem

Shoreham EGKA, United Kingdom
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