Quote:
Originally Posted by vettestr
Patrick,
I admit I have never sent the samples to different labs but have used the same labs as some pretty heavy hitters like Cummings and Detroit and are ISO cert'd. Tell me more, why the skepticism, what ya know?
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There was a long thread a year or two ago on the pelicanparts forum dealing with the inconsistencies not only between the
oil labs (with the same sample of
oil) but even when you sent the same sample to the same lab on different occasions. I experienced it myself when I was experimenting with the addition of the GM Camshaft and Lifter Prelube (not EOS) to adjust the ZDDP levels without getting the detergent level too high. I carefully measured and added some in, sent the sample out, it came back with the
Zinc & Phos numbers, I then added another bottle, drove it a bit, sent the sample in, and the ZDDP was almost half as much as it was on the first test! You can also compare the Virgin
Oil numbers from Blackstone, Stavely, Butler, et. al., for the identical oil and there can be a significant difference. Now, all that being said, I still send my oil out to have it analyzed, but I don't take the reports as gospel....
