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Old 12-18-2005, 04:42 PM   #1
Scooby Newbie
Member#: 100377
Join Date: Nov 2005
Default New engine break in?

Well, I should be getting my car back with the engine work complete, and was wondering what tips people had for during the break in period. The whole short block is new with the heads completely rebuilt with port+polish. It's been quite a while since the last time I broke in a new engine, and was wondering if anyone out there has particular recommendations on fluids, intervals, etc?
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Old 12-18-2005, 09:55 PM   #2
Scooby Specialist
Member#: 94299
Join Date: Aug 2005
Chapter/Region: Tri-State
2000 2.5 RS Sedan


Well, I would assume the obvious things, don't mash the gas to the floor, take it easy, don't stay at one speed for long periods of time (like highway driving), don't race anyone right quick, etc etc.

What you driving??
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Old 12-20-2005, 12:01 PM   #3
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Originally Posted by kero
What you driving??
Sorry, I forgot to include that. It is a 97 Legacy GT, with a new 00+ Phase II short block and a rebuilt head with port and polish, valve job, etc. I'm going to run non-synthetic for the first 5k or so before switching over to Amsoil 5W-30 Synthetic. Since the car has the 4EAT and the car was all apart anyway I installed a new tranny cooler, flushed the fluid and replaced with Amsoil ATF.

I put a lot of hard miles on my cars during the winter (I'm an EMT and have to be at work no matter what the weather conditions) so there is lots of wheel spin, having to rock the car back and forth if I get high-centered, and the inevitable AWD donuts in the parking lot at 1am. I'm mainly trying to figure out what is the best strategy is to get proper break-in but minimize excess wear.
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Old 12-20-2005, 02:32 PM   #4
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Member#: 99777
Join Date: Nov 2005
Chapter/Region: International
Location: North Dakota doesn't exist.

There are two schools of thought on break in periods, and they are on the opposite end of the spectrum.

One is what Kero said, the other is the "drive it hard, break it in to be driven hard"
I would drive it easy, but the other side does have some good information supporting them.
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Old 12-20-2005, 03:47 PM   #5
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Location: So. CA
'08 Foz Prem TGM
'10 Challenger R/T Blk


Did the folks who built the engine give you any input?
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