WHAT TYPE OF OIL??

jawbone said

Sorry to deviate from the subject but how many miles is break in oil used prior to oil change (500 miles?). Has only seen the dyno at this point. Don't see this car getting very many miles on it prior to me changing diff. Drive train is incomplete so will sit in garage for extended period of time once I remove the 7.25 diff. Will see engine runs at monthly intervals but not on the street.

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You can run it up to 500, but really, once the motor is through break in on the dyno, you can dump the oil and put in the regular oil before the power pulls. As by the time the break-in is done the motor is on its way to full pulls. Break in oil does not have the rust inhibitor and additive package that the normal oil has. The other good reason to dump the break in oil is, the break-in oil pushes any FOD ie crap left in the motor during the rebuild into the filter. You can then look at the oil and cut the filter to inspect for silver and such… also, the 500 mile thing is because the manufactures back in the day did not dyno cars as they rolled off the line. Most cars today are cold dyno’d as they move off the line.