Originally Posted By: chubbs1
Originally Posted By: gfh77665
A good example that going 10K on conventional is not automatic by any means...
No...it shows that when there has been repairs done you should check to see if the problems are fixed. It has no bearing whatsoever on the quality of conventional v syn.
There is no evidence to confirm that this is related to the use of dino oil. There is no reason to believe that a syn would have done any "better or worse" in this regard, either.
Generally, after such heavy work is done, I like to run several very short OCI flushes with the cheapest dino fluid (properly spec'd) I can find. Run perhaps three or four 500 mile OCIs to flush out any stuff (Si, K, Na, etc) from the leak and work.
After that, then you can go back to running the lube of choice, normalize over an OCI or two, and then get back to UOAs. If contamination is gone, or at least very diminished, then all is well. If it's still present, the work was not completed adequately.