Cudadude - welcome to the site
I'll counter the advice your dad got.
I would disagree that VPB is "better" than Rotella. I would also say that Rotella is not "better" than Delvac, or Delo. I have seen excellent UOAs from all brands, and none of them indicate that one brand is superior to another. I've also see UOAs that indicate a problem, and none of them have ever shown that it was a brand-related issue (typically a mechanical issues manifesting into problems).
Opinions run far and wide on lubes and filter, but there is data available, if you're willing to go find it. Unfortunately, even the data is often misinterpreted. I suggest you start by reading this:
http://www.bobistheoilguy.com/used-oil-analysis-how-to-decide-what-is-normal/
My point is that "best" or "better" can be proven, but ONLY after a long series of testing is done, and at much expense. Micro data analysis is probably the most reliable methodology, but it's also the most expensive and time consuming by far. Macro data analysis is reliable, too, but still takes a major investment. And when I say "long" and "expensive", I mean L-O-N-G and E-X-P-E-N-S-I-V-E. I seriously doubt the guy who gave your dad that advice has any credible data to back up the statement that VPB is truly better than any alternative.
The reality is that if you and your dad are going to follow the OEM OCI routine, then any properly qualified lube will do just fine, and no one oil (or filter) is going to distinguish itself above another. In short, any API certified HDEO that is spec'd for your application will suffice well more than good enough.
If you want to be brand loyal, there is nothing wrong with that approach. But it's not really going to help or hurt your engine one way or another.
You don't mention what equipment you're running the HDEO in, but presuming it to be a typical light duty diesel engine, 5k miles is probably very conservative for the OCI. I'd suggest using the least expensive HDEO you can find. When you use an API certified lube, you're assuring excellent protection regardless of the brand. That in mind, the "best" lube is the one that provides that assurance of good performance at the least cost.