I'm looking for opinions on the consequences of using a very slippery semi synthetic in early to mid break-in.

I'm approaching 5000 miles and have done EXTENSIVE research on oils looking for the best one. I have chosen Torco premium diesel. It's not a full synthetic, but it is VERY slippery. A friend says I should wait longer before switching to a slippery oil to allow more time for break-in. I want to change it now because early break-in is the hardest on the oil. So, should I change to the Torco now or should I use something not as good for another 5000 before going to the Torco for the next 10,000 miles?

FWIW, I'll probably drive 5000 miles w/ 7K lb trailer in the next 30 days.

 

Well, I'm not an expert, but I know Cummins says not to use synthetics until fully broken in, so personally, that's what I did. I suppose the worst thing that could happen would be the rings would never fully seat...

 

The owners manual and Cummins recommend not to use synthetics until 20,000 miles is reached.

Alan