06-26-2023, 09:48 PM
These are the notes on my SAE30 oil classed as "High Zinc Content" for my car. Zinc as ZDDP @ 500 ppm.
ZDDP (full name Zinc dialkyldithiophosphate) is a compound developed in the 1940s consisting of zinc bound to the anion of dithiophosphoric acid. They are soluble in nonpolar solvents, and the longer chain derivatives easily dissolve in mineral and synthetic lubricating oils.
The main use of ZDDP is as an anti-wear additive to lubricants, but over time their concentrations have been reduced to avoid damaging catalytic converters on modern vehicles. Crankcase oils with reduced ZDDP cause damage to, or failure of, moving parts lacking ‘full film’ lubrication in classic vehicles such as flat tappet camshafts and followers, which undergo very high boundary layer pressures and/or shear forces at their contact faces; and in other areas such as piston rings and gudgeon pins. The same ZDDP compounds serve also as corrosion inhibitors and antioxidants.
ZDDP (full name Zinc dialkyldithiophosphate) is a compound developed in the 1940s consisting of zinc bound to the anion of dithiophosphoric acid. They are soluble in nonpolar solvents, and the longer chain derivatives easily dissolve in mineral and synthetic lubricating oils.
The main use of ZDDP is as an anti-wear additive to lubricants, but over time their concentrations have been reduced to avoid damaging catalytic converters on modern vehicles. Crankcase oils with reduced ZDDP cause damage to, or failure of, moving parts lacking ‘full film’ lubrication in classic vehicles such as flat tappet camshafts and followers, which undergo very high boundary layer pressures and/or shear forces at their contact faces; and in other areas such as piston rings and gudgeon pins. The same ZDDP compounds serve also as corrosion inhibitors and antioxidants.