I would guess conductivity. They said it gives false positives on oils with too much zinc or other high pressure wear additives.
If anybody knows how they work exactly that would be worthwhile. I'm thinking my Fluke multimeter could do the same test.
Guess I better go look at that GM paper.
__________________
2004 VW TDI PD on bio
want to build 150 mpg diesel streamliner.
|