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Has anyone ever heard of diesel oil being good for flat tappet cam break in? Advice from a friend of mine, not sure if I trust it?
:)devil
 

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I run my usual oils in whatever cars I am breaking-in with GM EOS added to it. I have broken-in 5 flat-tappet cams in the last two years and not lost ONE.

Even a high-$ alum-head 327 in my '56 Chevy, I ran Mobil-1 10/30 WITH GM OES for break in. Wanted to test the theory that has been around for years. Broke-in just fine. Has 8,000 miles on it now - still on Mobil-1. Leak-down is LESS than 4% on all cylinders.

I don't trust ANY oil, straight, for break-in. I pressurize the oil system (with a drill), put the crank balancer at 10 degrees advanced on #1 cylinder, set the distributor in and line up whatever trigger it has set to fire. This means it's at 10 degrees adv and should be good enough for break-in. Then I take the oil filter OFF, dump it out, and put GM EOS in the filter. So, the engine will fire immediately, EOS will be the FIRST thing through the lines (other than the pre-lube oil) and get to the cam quicker.

After that, it just mixes with the rest of the oil during the initial 2000 rpm setting.

I hear the Brad Penn green oil is the best for flats. I also hear the Royal Purple break-in (specific) oil is safe. Again, even if I ran these oils, I would still put the EOS or similar in. Crane and Comp both have their own break-in flat-tappet additives. I wouldn't be afraid of these either. I just run GM EOS because I have NEVER lost a flat-tappet cam (or any other, for that matter) using it.
 

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Rumor has it even the diesel oils are now down on ZDDP > if I were you I'd be looking into some Brad Penn "break-in-oil"
 

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The last "good" conventional diesel oil that I would run in my truck was John Deere 15w-40 plus 50, API rated CI-4. Deere stopped making this oil just recently, switching over to API rated CJ-4 in anticipation of EPA mandates on off-road equipment. Most, if not all, of the readily available conventional diesel oils have already changed over to CJ-4 rating, with lower ZDDP levels. I would not think conventional diesel oil would provide adequate protection compared to a Brad Penn break-in oil.
 

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Hammerdown, Brad PENN is precious and $$$ to be breakin cam in with.:D You don't want that oil in there for maybe a hour or so, and dump it.
I still have that case of st 50w > getting awful dusty :D
Maybe next season I'll break into it ;)
 

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Has anyone ever heard of diesel oil being good for flat tappet cam break in? Advice from a friend of mine, not sure if I trust it?
:)devil
All diesel oil sold off the shelf ha..s very little bennefit anymore. The diesel particulate filters will not allow any good metals compared to three years ago. And I have seen and read a very detailed study comparing 10 different diesel oils on another websight that I am a member of, "TURBO DIESEL REGISTER." Rotella ranked lower than wallmarts house brand. Valvoline Premium blue was way up there as far as Diesel oils go.
 

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Rat bastards are going to ruin the world I tell ya!
One could actually look at it as a positive - They are pushing more and more of us to go to full-roller motors. Which, ultimately, is better anyhow.
 

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Brad Penn and Joe Gibbs both make specific break in oils for engines. THESE ARE THE ONLY 2 I WOULD TRUST AT THIS POINT FOR ANY FLAT TAPPET BREAKIN.
 

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Brad Penn and Joe Gibbs both make specific break in oils for engines. THESE ARE THE ONLY 2 I WOULD TRUST AT THIS POINT FOR ANY FLAT TAPPET BREAKIN.
X2! can't remember which one it was, but one of them purchased my
favorite oil / company/ refinery--kendall, which was my choice , when it
was the "GREEN" OIL!
 

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I'd just throw a bottle of EOS at the Rotella, and then dump it. You don't that crap in there any longer than it takes to break in the cam. From there I would start running either soemthing like Brad Penn, or add some ZDDPLUS to each oil change.

Hammerdown, Brad PENN is precious and $$$ to be breakin cam in with.:D You don't want tht oil in there for maybe a hour or so, and dump it.
Didnt we have this discussion in O.W. a six plus months ago and determined that the removal or reduction of ZINC was the reason that most oils arent sufficient for flat tappet cam break in???

THe OFFROAD Valvoline VR-1 with extra ZDDP "not legal for street use" and Torco TR1 are the most common off the shelf oil with high ZINC content.
 
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