[Smoove1010]

The Delo 400 LE 15W-40 that I can get at Costco is labeled as having "ISOSYN" technology and touts "synthetic performance" though it is not a synthetic oil. I couldn't help but wonder, given the conventional wisdom against using synthetic oil for break-in, if these near-synthetic properties would make it unsuitable for break-in.

I'm determined to make sure my rings seat, so (based on fear and superstition) I'm breaking in with Rotella-T before changing to the Delo 400 LE I've got in a box in my garage...