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....

Agreed. Although I currently make bio and don't run WVO (I'm headed that way though) I use a great method for determining a pH of 8. Learned about it on one of the above mentioned sites. Mix a little turmeric (from the spice counter at the grocery) with 91% isoprophyl alcohol. The exact proportions don't really matter. Put a few drops of the solution in a small container of your oil. If the pH is <8, the solution will be yellow. If the pH is> 8, it will turn some shade of red. Works great and is super easy. I'm not really sure what the pH of oil should be (somewhere < 8 I'm sure) but a pH of 8 is what we are shooting for with bio. Hope this helps.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln

See http://www.burnveg.com/forum/viewtopic.php?t=5
for TDS meter testing which shows acids/bases/salts/soaps in your VO, much better than PH.

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87 Mercedes 300TD, 81 300D, 95 Dodge Cummins 4x4