OIL RATING FOR FLAT TAPPET CAM SHAFTS

[0tter45]

Does anyone know the oil rating required to run flat tappet camshafts.  I think it is CI4 that has the appropriate amount of zinc in the oil for cams.

Thanks

Otter

[matt63]

This is a widely discussed topic in many car forums.  I don't recall any deep technical discussions in this forum.  I can't remember what ratings have sufficient zinc and phosphorous but you need to look for 1200 ppm+ of each according to some of the experts.  Some folks recommend adding wear or break-in additives to increase the levels of these components.  The Zn and P are also referred to as ZDDP.  Some of the boutique synthetic and dino oils have them as do some of the motorcycle oils.  I run a roller cam so it is not an issue. 

[GoodysGotaCuda]

Mobil 1 15w-50 is 1200ppm, thats what i run

[73EStroker]

I used Diesel 15W-40 as this oil still has Phosphorous and zinc in it and no detergent. I believe the rating was SJ on the can that you should look for. I also ran the GM EOS to break my solid flat tappet cam with no problems at all. Will keep using the diesel oil c/w the EOS as the car will only be run in the warmer months. I have enough EOS for 10 oil changes.

[0tter45]

Iam going to use castrol 15w40 CI-4 RATED IN MY NEW STROKER.   I have huges breakin oil additive for my flat tappet cam and iam going with the Gm Eos on the oil changes.  The eos is like 8 canadian a bottle.

Otter