Is there anything "magic" about engine break-in oil? I know you're not supposed to use synthetic oil (though OEMs ship new cars with Mobil 1) and flat tappet cam engines need ZDDP oils. But for a roller cam engine what should I be using? I was always told to use straight 30W mineral oil for break-in. Seems like there is no 30W oil in the stores anymore.
I see Total Seal 5W30 break-in oil at $13.97 a quart, Royal Purple 10W30 break-in oil at $8.97 a quart, COMP 10W30 break in oil for $6.97 a quart., and Lunati 10W30 break-in oil at $4.97 a quart. Surely COMP and Lunati don't make their own oil and I suspect this is all the same stuff, so why should I pay more?
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