Oil does not have a Ph....

It does however have an Acid-Number....

The only way to test accurately for this is by a Titration-Test....

Look under any BioDiesel tutorial for how to perform a Titration-test.

Ph Meters/ litmus paper will give meaningless results....

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http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....