Locomotion
Well-Known Member
Most oil, even diesel oils, have had their zinc reduced considerably. You have to do some research. I believe CJ-rated oil still had a moderate, but still, reduced amount of zinc. But finding specific numbers can sometimes be difficult. Supposedly, the zinc additives have a negative affect on modern catalytic converters! Some oil and/or vapors do get past the rings and into the exhaust flow.
I do break in my engines with older, conventional oil (15w-40 or thiner), but plan on adding some break-in lube with zinc additives as the supply runs out. Afterwards, I use Amsoil Dominator Racing Oil - 5w-20. If machine work and clearances are tight, it is possible to use thinner oils for better efficiency. New vehicles as well as appropriately built race engines fit that description.
Here is an Amsoil Tech Bullitin outlining some of their synthetic, high zinc oils.
https://www.amsoil.com/dealer/techservicesbulletin/MotorOil/TSB MO-2007-08-08 Flat Tappet.pdf
Amsoil also has oil sampling kits which provide info on EVERYTHING in the oil being sent in. That's a good way to find out exactly what your particular brand has in it, from wear particles to zinc content.
Amsoil source & info:
www.thelubepage.com
I do break in my engines with older, conventional oil (15w-40 or thiner), but plan on adding some break-in lube with zinc additives as the supply runs out. Afterwards, I use Amsoil Dominator Racing Oil - 5w-20. If machine work and clearances are tight, it is possible to use thinner oils for better efficiency. New vehicles as well as appropriately built race engines fit that description.
Here is an Amsoil Tech Bullitin outlining some of their synthetic, high zinc oils.
https://www.amsoil.com/dealer/techservicesbulletin/MotorOil/TSB MO-2007-08-08 Flat Tappet.pdf
Amsoil also has oil sampling kits which provide info on EVERYTHING in the oil being sent in. That's a good way to find out exactly what your particular brand has in it, from wear particles to zinc content.
Amsoil source & info:
www.thelubepage.com