Quote:
Originally Posted by oil pan 4
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. |
That's right, ZDDP got cut somewhat because the phosphorous poisons catalytic converters.
I think it's best not to go backwards for the oils though, SN oils have higher standards for other characteristics, if you're really worried about wear you can buy various antiwear additives separately and add them, although it's tricky business since adding too much can negatively impact the effectiveness of detergents and corrosion inhibitors and whatever.