Diesel Oil for Flat Tappet Cam Break In?
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Diesel Oil for Flat Tappet Cam Break In?

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    Default Diesel Oil for Flat Tappet Cam Break In?

    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?

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    Senior Member hot-rod 21's Avatar
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    Yup, Rotella T 15w40. Last I knew this was still a recomended procedure.
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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.
    Last edited by Beer:30; 09-22-2010 at 03:25 PM.
    Quote Originally Posted by gn7 View Post
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    Thanks guys! FINALLY, almost time to fire it up!
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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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    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. You don't want tht oil in there for maybe a hour or so, and dump it.



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    Quote Originally Posted by gn7 View Post
    Hammerdown, Brad PENN is precious and $$$ to be breakin cam in with. 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
    Maybe next season I'll break into it
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    Quote Originally Posted by One More Year View Post
    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?
    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! Yeah, they are really after this "down stream" contamination thing on everything. Its the required warranty period that is really drive it. Factories just can't warranty the stuff for a 150,000 mi with any metals in the tail pipe.



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    Last edited by gn7; 09-22-2010 at 07:57 PM.

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    Quote Originally Posted by gn7 View Post
    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.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Ya know Beer 30, you can look at it that way. And maybe that works for about 75% of the boaters out there. Maybe more. But you know, if the f'ing stuff can't lube a flat tappet cam, it can't lube my motor either. And it a "full roller" what ever ther hell that means. Its not my cam and lifters I am worried about.



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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.
    Chris Straub
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