Proper engine break-in procedure - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-28-2005, 09:11 AM   #1
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Default Proper engine break-in procedure

I just rebuilt my engine and my car is almost ready. I was just hoping someone would chime in on the proper break-in procedure or the manufacturers reccomendations.
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Old 10-28-2005, 09:16 AM   #2
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Drive reasonably. Mixture of driving keeping it under say 65mph for the first 500 miles. At 500 miles change the oil. This will get any metal fragments from the new parts out of the motor.
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Old 10-28-2005, 11:35 AM   #3
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I always change the oil and filter after the first half-hour or so of operation with a new engine. We garage rebuilders don't have a bazillion cubic foot clean room to assemble, as the factory guys do, and it gets crud (if any) out of the engine before it can do any harm.

Assuming you used moly rings, there is essentially no break-in period on a modern engine after initial fire-up at a fast idle to break in the cam and lifters.

Watch the oil pressure and temp the first half hour, change the oil and filter, and then drive it like you stole it.
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Old 10-28-2005, 11:46 AM   #4
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I was being good. Since Bob said it.

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Old 10-28-2005, 11:51 AM   #5
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Do not use cruise control. For the first 500 miles, you want to vary your rpm'* as much as possible.
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Old 10-30-2005, 12:36 PM   #6
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Gonna get my wiring hooked up today, then it'* time to breakin.

Is there any RPM to keep it below? When I bought my last new car they said for the first 500 miles to keep it under 3500 RPM and then to gradually raise it.
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