Engine Break-in oil questions

Justin87

Active Member
Aug 7, 2017
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Hello all!

I think it’s about time I finally start my 90 GT that I did a motor and transmission swap on.

I would like some opinions on break-in oil.

What brands do you guys like?

After the initial start, setting timing and all that (assuming I can get it running ) how quickly should I change the initial break-in oil?

I’m under the impression that “first start” oil should be different than the first drive/actual engine break-in period, but I also am a rank amateur so who knows.‍ :shrug:

thanks for your time!

-Justin
 
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HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
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Memphis TN
Break in oil is mainly needed for flat tappet cams....if your engine has a roller cam, it should, forget about break in oil and just run whatever oil you are going to run in it for life.
 
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stormsedge

Active Member
Jun 17, 2018
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Here
forget about break in oil and just run whatever oil you are going to run in it

^^I agree^^ There was a day (so many years ago) when a light non-detergent (10 or 20w) was common practice in new builds...I never did it, and the guys I knew building real racing engines never did it. Start with what you are going to run.
 
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j753303

Member
Aug 25, 2020
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as long as its not synthetic. i would wait at least 1000 miles for that.
 
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Justin87

Active Member
Aug 7, 2017
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Thanks guys.

got all my fluids sorted. Going for a first start this weekend!