Re: What have you done to your Festiva today!?
The main reason oil turns black is usually not that it's coking or burning. It's absorbing particulates from the blowby gases. So the color of the oil will tell you how hard the detergents have been working, and if they get depleted you're in just as much trouble as you would if your oil has broken down.
Used oil analysis is a very handy thing though.
Originally posted by Christ
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Used oil analysis is a very handy thing though.
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