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Reply to "Can I rely on dielectric constant?"

Rand,
The test I do to my car´s oil is simply to evaluate the condition of it periodically. I´m currently using Mobil 1 5W-50 and doing changes every 13.000 km provided the condition of the oil remains stable or with a normal increasing tendency of the instrument´s reading compared to the condition when new.

I don´t know what the scale of the instrument actually means but I guess it's usefull anyway because if the reading is 6 with new oil, and after 1000 km it´s still 6 or maybe 7, then I conclude that the oil is in good condition because the increment as a percentage of the full scale of the instrument is very low.

Tomás
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