The anti-ware addtive in oil is not zinc phospate, its zinc based.
The chemical you speek of is Zinc dithiophosphate - Wikipedia, the free encyclopedia .
Oil mixers didn't stop using it, they just cut out half to 2/3 of the ZDDP found in older oils when compairing SH to modern SM rated oils. You can still get oil with high 1980s levels of ZDDP you have to look for SH or SJ rated oils, such as royal purple (SJ) or mobil1 MX4T 10w-40 or V-Twin 15w-50 (SC rated).
Or buy ZDDP by the quart, $60 for a quart of oil addtive that contains very high levels of ZDDP, up to 50% if I remember right.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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