Copied and pasted from another fourm.
Quote Originally Posted by lostforawhile View Post
wanted to pass this on,and pass this on to anyone who has an older engine with solid rockers or solid lifters,the epa is removing the zinc/phosphorus additives that have been in oil forever, we need these additives in our oil to prevent metal to metal contact in the valve train, there is a lot of discussion about this on the hamb,which is a very old well respected hot rod site, this is a link to an additive they are recomending, you add four ounces of this at each oil change. this isn't some wonder additive, this is whats been removed from the oil. here's the link and i will add info as i hear about this,someone please add this as a sticky. http://www.zddplus.com/
Quote Originally Posted by 2ndGenGuy View Post
Has Zinc been removed from Engine Oils?

http://www.mobiloil.com/USA-English/...otor_Oils.aspx
Question:
Has Zinc Been Removed from Motor Oils?
I am having thrust bearing failure in a 4.6 modified performance engine. This is a street/strip engine. Many of my friends are having the same problem. I think it is the result of the removal of zinc from the oil. I was told by two separate racing engine builders that the EPA ordered the removal of the zinc from over-the-counter motor oil. I use Mobil 1 5W-20. Is this true and do you think a zinc additive might help?
-- Randy Lovejoy, Americas, GA

Answer:
The active ingredient that you are talking about is phosphorus which is added thru a component called ZDDP. For products that meet the new ILSAC GF-4 specification the phosphorus levels for the oil must be less than 800 ppm phosphorus. The ILSAC level for phosphorus has been reduced to protect the catalytic converter and other emission protection equipment. The engine manufacturers are confident that this level of phosphorus will protect both new and older engines. However, there are Mobil 1 products which have a higher level of phosphorus (phos) and can be used in engines in racing or high performance applications; see the attached table.
Cliffs:
ZDDP is being removed from current oils.
This stuff is also know as zinc(the thing that keeps ur valvetrain alive)
New oils will cause problems unless additives are added.
FUCK the EPA.


Lets try and tell everyone that has a pre obd2 car about this. Apparently all obd2+ cars have diffrent build materials that dont require the presence of ZDDP in the oil. Older engines neeed this stuff to run problem free.
Link to said forum >> http://www.3geez.com/forum/showthrea...499#post930499