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Break-in oil for rebuilt motor

Old 05-26-2009, 01:47 PM
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Originally Posted by Raylar View Post
At Raylar Engine we like to use Shell Rotella 15-40W for breakins, got a great zinc and additive ashless wear package and after breakin you can switch to synthetics. I also like the gallon bottles, pouring 10 quarts from quart bottles just sucks!

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Ray @ Raylar
Thats the same as I was told on the Rotella,claims to have the highest zink level.

The last 3 rebuilds I have used the cheap Napa straight 40 for break in, its only in there maybe about 1 hour, 5 dyno pulls or until I put a good load on it to seat the rings.Rob

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Old 05-26-2009, 01:48 PM
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What about break in on a NEW long block? Rotella still OK? What about a straight HD40?
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Old 05-27-2009, 12:51 AM
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I would use the Rotella and change it and the filter between 5 and 10 hours. Also carefully cut open the filter that is removed and spread the pleated media inside and look for debris, especially iron, steel and aluminum particles. If there is a lot, check the oil filter again within a couple of hours of use and make sure the debris stops.

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Old 05-27-2009, 07:23 AM
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Thanks for the responses.

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