Essentially nitrates and molybdates.
Cavitation pitting occurs in diesel engines because of the vibration/shock. The vibration/shock causes bubbles to form, and then collapse. Collapsiing a sphere can take/create thousands of psi or localized pressure, which chips away at cylinder lining. On larger (wet-sleeve) diesels it is required to check SCAs (Supplemental Coolant Additives) regularly, every 6months on mine.
Detroit Diesel has some good info on their site, likely others do also. This SCA is now in the M-B coolant recovery tanks, I don't believe that they started installing SCA filter type coolant recovery tanks until the '90s though.
Quote:
Originally Posted by tangofox007
Some coolants rated for use in diesel engines have a supplemental additive that reduces cavitation around the cylinder liners.
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