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truckernix #1196071 Tue Dec 20 2016 12:59 AM
Joined: Oct 2016
Posts: 812
I generally steer away from oil threads, but here I am... what about this article? Seems like there might be a limit to how much zinc you should add...

Too much zdp causes camshaft damage...

Last edited by Norcal Dave; Tue Dec 20 2016 01:16 AM.


1950 Chevy 3600 (resto-something) - I’m done!

Jay Zed #1196075 Tue Dec 20 2016 01:43 AM
Joined: Dec 2006
Posts: 1,155
Shop Shark
I wrote to Vavoline about ZDDP content in their "off road" racing oil. Now on their oil cans it reads with ZDDP on a bright label on the VR-1 racing oil cans. Also about the additives to oil... Vavoline racing oils far exceedes any oil requirements and those reported "super Nano lubricantes" just burn off within 100 miles. The Vavoline oil is blended not to break down in extreme heat or cold. For our 235 they recommended 10-30 wt....if you have questions Vavoline will give you an answer via email....just go to their website.

Jay Zed #1196084 Tue Dec 20 2016 02:14 AM
Joined: May 2001
Posts: 8,386
Extreme Gabster
The way I understand it the high ZDDP is a requirement for the break in cycle of a new cam and new flat tappet lifters. After break in it is not so important. If you used a new or reground cam and new or resurfaced lifters in your rebuild you should definitely use a high ZDDP break in oil.

I still use a supplement with every change on my classics with flat tappet cams just in case.

"It's just a phase. He'll grow out of it." Mama, 1964

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Jay Zed #1196136 Tue Dec 20 2016 04:46 PM
Joined: Feb 2000
Posts: 4,720
VR1 is good for any type of cam, including racing engines, so your 261 will be cover with no problems.

Jay Zed #1196172 Tue Dec 20 2016 09:05 PM
Joined: Sep 2008
Posts: 882
Shop Shark
Another 'you need zinc' thread? Oh yeah!!!

First, the oil of today has THE SAME AMOUNT OF ZINC FROM THE 50s!!!!!!!!! THE SAME AMOUNT.

The reason zinc was excessively added to oil in the 70's was because its a cheap anti-oxidizing agent. It was never added to street cars for protection of flat tappet cams.

Flat tappet motors are still being made today (they call them inverted bucket) and are usually in lower performance engines because of cost and modern oil still provide sufficient protection with the current API standard.

The ONLY VALID reason for adding zinc is because of a high performance cam with double valve springs and the like. Even that is questionable because if you have such a high performance cam you're gonna be using roller lifters, not flat tappets. So if you want a whumpa whumpa engine and still run flat tappets, they yeah, you're gonna need something like ZDDP to make it last... but zinc over 1200ppm is a waste and WILL start to etch the metal making more friction etc.

So unless you know you have a high lift cam and very stiff (outside factory spec) valve springs adding ZDDP, using synthetic oil or pouring unicorn tears into the oil is not going to do anything but waste money.

And no, you don't need ZDDP at break in. Assembly lube is all you need.

Que all the race car experts that say otherwise (just remember, I never said anything about race cars... I EXPLIXITLY stated that high lift cams/high tension valve springs *might* need additives... but really if you're doing high lift the smart people will have switched to rollers).

Jay Zed #1196175 Tue Dec 20 2016 09:33 PM
Joined: Feb 2004
Posts: 26,956
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Jay Zed #1196257 Wed Dec 21 2016 03:43 AM
Joined: Oct 2016
Posts: 812
I am glad that we are all in agreement!!


1950 Chevy 3600 (resto-something) - I’m done!

Hotrod Lincoln #1196264 Wed Dec 21 2016 04:28 AM
Joined: Sep 2001
Posts: 31,811
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- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
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Jay Zed #1196277 Wed Dec 21 2016 04:57 AM
Joined: Mar 2010
Posts: 10,720
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