I have always used Rotella, but they no longer list API SERVICE CJ
Enthusiast
Do we to add Zinc to an oil change ?
I have always used Rotella, but they no longer list API SERVICE CJ
94 Chev Blazer, 6.5TD, 3.42, 4WD,Gear drive,,Remote FSD behind drivers headlight,,Mobil 1 in difs and trans,Rotella 30W, Over a quarter of a million miles !! Member -1.94 club.
Administrator
I don't see any problem with it in older vehicles. Zinc was removed from recent oil formulations to protect late model emission systems.
Missy Good Wench ( Moderator)
The Zinc is/was used to protect parts like flat tappet cams/lifters from failure...
The roller lifters used in the 6.2/6.5 are not a problem.
As Maverick mentioned...the removal of zinc was to protect emissions equipment.
A good quality diesel rated oil will be fine.
(1) 1995 Suburban 2500 4x4
(1) 1997 Astro
(1) 2005 Suburban (Papa Smurf)
THIS IS BOW TIE COUNTRY
Enthusiast
The red bottled STP had Zinc in it.
I still have a few bottles that i add to my old diesel's oil.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews
Proud Deplorable
This is a big concern in the Old Mercedes overhead cam flat tappet world. There are a number of additives available; google "ZDDP Additive". Until recently, the answer was to use Rotella T-6, but it sounds like maybe that's no longer the solution.
The Constitution needs to be re-read, not re-written!
If you can't handle Dr. Seuss, how will you handle real life?
Current oil burners: MB GLK250 BlueTEC, John Deere X758
New ride: MB GLS450 - most stately
Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510
Missy Good Wench ( Moderator)
Several manufacturers offer racing oils with the ZDDP package that is needed for flat tappet cams.
The roller lifters do not need the zinc to be happy campers...
Same pretty much holds true for bearings, rings and other components.
The zinc and other chemicals that make up the ZDDP package raise hell with the catalytic converters and with the government mandate that the emissions systems be able to last much longer than previous systems.....the additives were removed as they pollute the cat and KILL IT.
There are Zinc additives available...but too much is not good either.....
I have explored this arena...as it applies to the fresh engine I am building for the Snow cat.
The only issue with the new oils are with older flat tappet cams.....
All 6.2/6.5 are roller lifters....not an issue.
https://www.google.com/url?sa=t&rct=...1LgYRon-bNVb54
(1) 1995 Suburban 2500 4x4
(1) 1997 Astro
(1) 2005 Suburban (Papa Smurf)
THIS IS BOW TIE COUNTRY
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