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John...I'm close to installing my engine ('87NA944) which I'd rebuilt and subjected to my own (DIY) Sunnen AN-30 paste cylinder refresh...much as I gather has been done on your 924.
So I'm very curious as to how you plan to break in your engine. I've been a bit over the map on this, but my current thinking is as follows:
First Oil Fill: 10/40 Dino (detergent). First Run: 20 minutes high idle (2K RPM). Drain Oil. Reason for detergent oil - help to clean rebuild residue.
Second Oil Fill: 10/40 Dino (non-detergent), possibly with zinc "break in" additive. Second Run: Take it on the road...and do about a dozen aggressive accelerations/decelerations to set rings. Drain Oil. Reason for non-detergent oil - to help promote proper bedding in of rings. Zinc additive just for this run...as this run is aggressive and I want to protect tappets. (Possible change - use straight 30 weight oil for this run?)
Third Oil Fill: 10/40 Dino (detergent). Third Run: 500 miles normal driving. Drain Oil.
Fourth Oil Fill: 10/40 Full Synthetic (detergent). Engine Break In Complete.
So...how does this sound? And what are your break in plans?
Feel free to share comments, and/or to question my sanity. Thanks!
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