Came across this recently,
Bosch - Why Diesel Fuel Injectors Fail - Diesel Power Magazine
Sounds like the Lubricity test limits for diesel fuel are slightly different.
"The maximum allowable wear scar in the United States is 520 microns (460 microns in Canada)."
I did not know that..... thought I'd share ! Haven't tracked down the actual govt regs, but at this point I'll run with the assumption that DieselPower verified this statement, before publishing.
Good general article on diesel injectors, and their failure modes.
(P.S. - I linked to page 2, where I took that quote. Bottom of the page gets you back to page 1, if you want to read the whole article).
Rgds, D.
Source: http://www.tractorbynet.com/forums/oil-fuel-lubricants/271743-diesel-wear-scar-test-limits.html
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