3406E Break in question | TruckersReport.com Trucking Forum

Most advise to break in with conventional, then switch to synthetic.

I often go against conventional (pun intended) wisdom, and always have here too.

I always advised customers to break in with the oil you’re going to run.

My 60 has 256k running on Mobil full synthetic. Oil usage stopped around 36k IIRC.

I do change first oil @ 1k, 2nd @ 5k, then every 10k till oil usage stops.