Originally Posted By: greg7637
Thanks for the info, Roller cams in the reman, but if they ahd done the breakin would they recommend a break in oil additive?
Yeah - they probably would...the 20 minute mid RPM run breaks in a cam to the lifters on a flat-tappet motor...but the rings, etc. still need a while more to seat. If the rings don't seat, you'll get high oil consumption that will never go away...
It's funny though, that they recommend a break in oil, which according to RP has more ZDDP to reduce wear, while others recommend not using synthetic, because it reduces wear too much!
I think you're OK with a good quality Dino in recommended viscosity. In a rebuild, I am a fan of running it for an hour, change the oil and filter, fill with a good dino again, run it for 500 miles, then go with whatever your permanent fill is going to be.
It's a bit cautious...but rebuilds aren't always as clean or close tolerance as factory engines, so I take the extra step to ensure that only clean oil is circulating in the rebuilt engine...I had over 100K (225K total) on the last rebuild I did (an Olds 350) - and I even re-used the orginal pistons (they mic'd out OK...) with only a cylinder hone needed, and all new rings, bearings, and a new cam and lifters. Heads were re-done with new valves and springs.
And all that engine ever ran on was dino - in a 10W30 or 10W40 (in summer)...and it was an OHV V-8 much like your Dodge...with the exception of the cam and fuel delivery/ignition systems...but internally, it's the same architecture and similar materials...
That said, I would follow the rebuilder's recommendation, so that if there's a problem, you can show that you've complied with the terms of the warranty...