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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
Break In oil
Things go well, I should be breaking in all the new parts of my motor in the next couple weeks. Heads, cam, rockers, push rods, basically everything but the rotating assembly.
In every new motor I ever purchased, I ran a quart or so, or Marvel Mystery Oil in the oil for the first 2K miles or so. It's a good top end lubricant.
Now, that was before synthetic oil. My car has only been run on synthetic and the internals are spotless. No grime anywhere, it's like a new motor internally.
Since I am putting on new heads, I'm considering throwing in a quart of Marvel, since it worked so well for me in the past.
i would throw it in but, only a cup or so. my ex girlfriend's father had a dodge that had a tapping lifter. i happened to be at his house when he pulled in his driveway. the long and the short of it is, that i heard the tapping, watched him put in 5 small cap-fulls of marvel in the oil, rev it up to 1,000 rpm's intermittently for about 20 seconds, and the tapping quit. that sold me on marvel. i also use about a cup or so PRIOR to an oil change as a flush of sorts. my understanding is that the highest majority of it is almost all detergent.
I talked with CompCams tech guy the other day with a similar question. Even though I'm breaking in a roller cam, they recommend using regular Dyno oil, Actually he recommended using Valvoline VR1 for break-in. My question was that I am planning on installing the cam several weeks in advance of installing heads, rockers and the rest of the stuff. So it could be a month or two before initial startup and I was worried that the assembly lube would just flow off the journals and cam lobes. I was told by the tech that this is a legitimate concern and that in that case I could use White Lithium Grease on the bearing surfaces and the cam lobes during installation. Then prior to closing it up, put assembly lube on the lifter tips. Anyhow, I have got the feeling that the break in for roller cams is not near as critical as for the flat tappet cams.
Just run it and do a quick oil change and get it out of there. Just to start a conversation, all I ever run is Rotella 15/40 for both gas and deisels. I just tore down a Cummins and the crank and rod bearings were still in spec with 415,000 miles!