I would contact the 3rd party vendor just to see what they had to say.
The only reason I ever used conventional when breaking in an engine was cost, back then there was a bigger price difference between conventional and synthetic and since the OC's were shorter it cost less.
Yeah I doubt I'll get a meaningful response. But I did send them an email
Sorry to hear - I'm sure this one will work out.
If it helps - I found out mine was a dealer demonstrator vehicle. Which means it likely was ran hard right from the start.
Doesn't burn a drop of oil!
Thanks, Yeah I'm hopeful that this latest engine will give me no problems. Despite all the headaches. S2K holds a special place in my heart.
After a few hours of rabbit hole diving, I ordered some Amsoil break-in oil (SAE 30).
Is it likely not needed? Probably. I'm pretty sure I could have gone conventional from the store.
Previously I was running Motul 300v 5w30 in my old engines.
Engine #1 ran 2 track days with the thrust washer in the oil pan. (This was original engine, thought it was a slipping clutch at first.)
Engine #2 ran a couple track days even with the thrust washer installed backwards. (This engine was purchased from a dismantler, turned out to be a incorrectly rebuilt engine)
Plan for this engine is, break-in oil until warmed up to operating temp.
Replace break-in oil and OEM filter with more break-in oil and new OEM filter.
Then change out at 500 miles.
Debating if I should do 1 more break-in oil cycle for another 500 or switch straight to motul 300v.
Again, probably overthinking it but that's the plan.