Overhauled 4.2l Engine Break-in What oil to use? - JeepForum.com
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post #1 of 26 Old 09-12-2013, 07:41 AM Thread Starter
seabass1858
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Overhauled 4.2l Engine Break-in What oil to use?

I will be ready to fire up my freshly built .40 over 4.2l and was wondering what oil to use during the break in procedure. I used rotella 15-40 on my chevy 350s but this is the first master over haul where I actually changed out the cam and lifters.

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post #2 of 26 Old 09-12-2013, 08:17 AM
Cutlass327
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Regular 10w30 or 30w. No synthetics.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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post #3 of 26 Old 09-12-2013, 08:18 AM
CSP
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Joe Gibbs or Brad Penn oils. I believe that both have a break in oil with higher levels of ZDDP to help with the cam break in.
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post #4 of 26 Old 09-12-2013, 08:24 AM
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Quote:
Originally Posted by CSP View Post
Joe Gibbs or Brad Penn oils. I believe that both have a break in oil with higher levels of ZDDP to help with the cam break in.

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post #5 of 26 Old 09-12-2013, 08:27 AM
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Use a non-synthetic break-in oil. Mobil 1, Royal Purple, and comp cams are popular. Do the break-in procedure per cam instructions.

Drail oil, change filter, and put in non synthetic mobil 1 or rotella and run that for 500 miles. Repeat....Then change every 3K until 10K miles and then you can start to use synthetics. This has worked well for the motors I have helped with and am about to do the same on mine in a couple weeks!
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post #6 of 26 Old 09-12-2013, 08:40 AM Thread Starter
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good information to know thx.
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post #7 of 26 Old 09-12-2013, 08:49 AM
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FWIW....

If you are looking for a more readily available oil then the ones CSP mentioned, my dyno guys, who specialize in re-building older hot-rod engines, were very adamant about using Valvoline VR1 conventional oil in my 360.

The NAPA near me always has it in stock.

Matt
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post #8 of 26 Old 09-12-2013, 08:54 AM
swatson454
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Here are some links. I know it's more expensive but I don't trust any modern oils with the little "Approved" donut on the label (or whatever it says).

Driven Break-In Oil

and Driven HR1 for normal use

Or Brad Penn 15W-40


Shawn

Edit: That might be a little over kill for a stock or milder cam profile but you'll be safe.

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post #9 of 26 Old 09-12-2013, 09:22 AM
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What you need is 15W-40 CJ4 oil. It is the highest ZDDP of the readily available oils, or you can use the specialized oils as mentioned above.

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post #10 of 26 Old 09-12-2013, 09:44 AM Thread Starter
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what about chevron delo 400le 15-40?
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post #11 of 26 Old 09-12-2013, 10:08 AM
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Personally, I think the type of oil you use for break-in is a little over-blown. Think about it, you only run that oil for 20 minutes.

IMO, as long as you use a conventional oil with a zinc content of more than 1000 ppm, you should be OK. I think it becomes more critical for high-performance racing engines with radical cams, but we're talking a tractor engine here.

But that's just my opinion. Shawn would probably slap me right now, if he could.

Matt
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post #12 of 26 Old 09-12-2013, 10:22 AM
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Quote:
Originally Posted by Matt1981CJ7 View Post

But that's just my opinion. Shawn would probably slap me right now, if he could.

Matt
LOL

That's the most critical 20 minutes that engine will ever see. Actually, if it's a stockish cam, you could run the expensive break-in stuff for the first 20 minutes and then drop down to one of the less-expensive oils like VR1, Mobile 1,... that sort of thing.

You might even be ok for the break-in, but that's not a chance I'm personally willing to take. No pulling and rebuilding a brand new engine for this kid.

Hey Matt,


Shawn

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post #13 of 26 Old 09-12-2013, 10:44 AM
Matt1981CJ7
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How's it hangin' Shawn?

I'd like to point out that zinc (ZDDP) isn't the only anti-wear additive they put in oil. In fact, too much ZDDP can be a detriment according to Brad Penn. Phos and Moly are also used as anti-wear agents along with ZDDP. I think what's critical is the total parts per million of anti-wear additives.

This has some interesting data. As you can see, Lucas and Redline racing oils have the largest amount of anti-wear, by far. By comparison, there isn't a lot of difference in the rest of the "racing oils".

Matt
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post #14 of 26 Old 09-12-2013, 11:03 AM
jdarg
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I've used 5 quarts of conventional 10w30 and one quart of "break in" oil, i.e. Lucas on two motors now. I don't think it really matters if the cam was installed w/ proper assembly lube though.

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post #15 of 26 Old 09-12-2013, 11:12 AM Thread Starter
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I want to do this properly and I am trying to find a redily available oil. Advance, Autozone, and O'riely are the only auto parts stores around me. theoreticaly if i can get out of work at a decent hour to finish installing my rockers I would be installing the engine tomorrow and startup on saturday.
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