Carrying out a one-drop engine-oil test, using a kit or plain cardstock, at regular intervals allows you to track and compare the health of your engine.

DIY Engine Oil Tests

How useful and accurate are one-drop tests?

Sailors obsess over the health of their engine; it is the heart of the boat (other than the rig, sails, and through-hulls). Failure is inconvenient, expensive, and even dangerous. And sailors love their maintenance, or so it seems. Anything that promises to ease the mind for a few dollars merits investigation.

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