ZDDP in EJ22s??

[SUBARU3]

Has anyone here discovered the importance of adding ZDDP (Zinc to our precious EA71 and 81s)? What about the early EJ22s and EJ18s? I believe they have roller tappets, but I'm confused about this. Do they? Are the early 90s EJ22s the same as the mid to late 90s EJs?

 

What a science! Most oils now days do not have enough to prevent premature wear on our flat tappet engines.

 

I know the mobil 1 15w50 has about the right amount at 1200 ppm, but most oil is severely lacking.

 

I just added additional to all my EA engines tonight.

 

Good reading:

http://www.bobistheoilguy.com/cms/ (search ZDDP)

 

 

http://www.zddp.net/

 

http://www.lucasoil.com/products/display_products.sd?iid=82&catid=9&loc=show

[porcupine73]

The early 90's 2.2L's have some differences from the late 90's 2.2L's. One being that the late 90's ones are interference design and the early ones were not. And the earlier ones had HLA's and the later have solid lifters. I have a good article from endwrench saved somewhere that had a detailed year by year description of changes in the engines.

 

Yes now that the pesky API specs for phosphorous have dropped so much to prevent the supposed risk of spoiling the cats, the modern oils don't have so much zddp in them. If it's zinc you want, one product people used to like was Street Legal Oil Boost. A great product that used to be available was Specialty Formulations SX-UP but it doesn't look like that will ever be made again.

 

For my mid 90's soobs I have been running a heavy duty diesel engine oil. These tend to have more zddp and antiwear additives in them than the standard passenger car motor oils.

[Petersubaru]

the new shell syn blend called T-5 ..10/30 diesel oil..plenty of zinc..seen at WMart $15..makes life a lot easier if zinc is what you are after..

[SUBARU3]

I'm assuming that the EJ series from say 1990 to 1996, (prior to interference design) is not a flat tappet design? (Like the EA series)?

[bulwnkl]

I know there's lots of concern over the change from one anti-wear additive to others, but FWIW I haven't experienced adverse impact to iron wear (that's what cam wear from the followers will show up as in analysis) by using the newer, lower-phos-limit oils in my EJ255.

Edited July 28, 2010 by bulwnkl

[porcupine73]

Generally it shouldn't be an issue since they do use other antiwear additives such as boron etc. There is some specific thing on older engines that I forget now that people preferred zddp over anything else for, was it roller rockers or something like that?