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cjbiagi wrote:I would be more concerned about the low levels of zinc (ZZDP) in modern oils, especially for cars with flat tappet cams. The zinc is what prevented the cam from wearing on the lifters. There are specialty oils with higher levels of zinc or additives that can be used. I usually throw in a half a bottle of GM EOS which is used for breaking in new engines and flat tappet cams. While GM does not recommend it for a general additive I believe is based more upon the EPA regulations than anything else. They have to make that statement. It is basically a additive rich in zinc which apparently is not good for emissions which is one reason its' level was greatly removed from current oils. Also, the fact that all new engines have roller cams makes it not necessary like it was for old engines. There is a ton of info on this subject, here's enough to get you started. There are also a lot of different additives that contain ZZDP or specialty oils that already have higher levels.
http://www.hotrodhotline.com/pr/2009/09zzdpapril/
http://www.drivenracingoil.com/news/dro ... motor-oil/
EVL VEGA wrote:cjbiagi wrote:I would be more concerned about the low levels of zinc (ZZDP) in modern oils, especially for cars with flat tappet cams. The zinc is what prevented the cam from wearing on the lifters. There are specialty oils with higher levels of zinc or additives that can be used. I usually throw in a half a bottle of GM EOS which is used for breaking in new engines and flat tappet cams. While GM does not recommend it for a general additive I believe is based more upon the EPA regulations than anything else. They have to make that statement. It is basically a additive rich in zinc which apparently is not good for emissions which is one reason its' level was greatly removed from current oils. Also, the fact that all new engines have roller cams makes it not necessary like it was for old engines. There is a ton of info on this subject, here's enough to get you started. There are also a lot of different additives that contain ZZDP or specialty oils that already have higher levels.
http://www.hotrodhotline.com/pr/2009/09zzdpapril/
http://www.drivenracingoil.com/news/dro ... motor-oil/
I read a hot rod or car craft article years ago about ZDDP in oil and the levels dropping. For solid lifter cams they recommended running Rotella T diesel oil as it (at the time) contained high levels of ZDDP.
My Vega has a pretty aggressive for street driven pump gas car Lunati solid Cam (306in/316ex adv, 259in/267ex at .500, .554in/.566ex lift) so i only run diesel oil in the car.
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