Oil question

[E30M30]

We were discussing mineral versus synthetic oil. Which oil do you recommend for the old V8's ???

[Lowend]

I pretty much always reccomend Synthetic oils. There is no catagory (other than cost) that a mineral oil out performs synthetic.
My personal fav is Amsoil,

[LowBuckX]

Royal Purple 10/30 here

[Zee]

If you are running a flat tappet cam, synthetic or not, make sure you are running an oil with sufficient Zinc or an additive that adds it. Comp cams recommends Rotella. I broke mine in on Valvoline VR1 which has a ton of zinc, and Crane's break in concentrate. Second oil change was VR1 with STP. Going forward, I will run Rotella spiked with STP unless I find a commonly available synthetic with enough zinc to keep my cam from going flat.

[LowBuckX]

If you are running a flat tappet cam, synthetic or not, make sure you are running an oil with sufficient Zinc or an additive that adds it. Comp cams recommends Rotella. I broke mine in on Valvoline VR1 which has a ton of zinc, and Crane's break in concentrate. Second oil change was VR1 with STP. Going forward, I will run Rotella spiked with STP unless I find a commonly available synthetic with enough zinc to keep my cam from going flat.

Thats an excuse used by a well known cam grinder for a rather large batch of cams incorrectly heat treated and sold anyways.

I had a TRW cam wipe on me after running RedLine oil..TRW gladly replaced the cam stating that their supplier (unnamed company) had a heat treat problem. They had no beef with my use of the redline.
I have a beef with the $9 price per QT when Royal Purple is $5 but thats another story.

I dont care what Lazer or Comp claim TRW seems more honest than them. I am a Comp fan but dont like the CYA game. I do like the breakin additives.

[Zee]

I guess everyone has an opinion but the purpose of the zinc in the first place is pretty clear. Since the issue has occured with Comp, Crane, Crower, Lazar and likely others your assertion only makes sense if all of these cams are heat treated similarly from a single supplier. If that is the case, then all of the previously mentioned cam manufacturers are taking a loss replacing these cams for the benefit of whom?

Anyway, excuse or not, the original use of the zinc remains and I see little downside in using a high zinc content oil which for all I know, Redline might very well fall into that catagory.

[vintageracer]

Diesel oil for old cars. CI4 rating. Lot's of zinc. Do a search on www.ncrs.org under the name Duke Williams for all sorts of information.