You've not mentioned anything about the operational conditions or environment, so I'm going to assume they would be "normal" and not stupidly extreme. I'm going with 5k mile "normal" OCIs. While I believe that HPL is an outstanding product line with proven excellent customer service ...
It is very probable that no premium lube is worth the cost for 5k miles in your Toyotas. Go get some ST or Kirkland or some other house brand if 5k mile OCIs are your limit. Seriously; I'm not bashing top-end lubes. You're not doing anything but wasting money by changing oil every 5k miles, so you might as well reduce the waste by purchasing some value-based products. In short-to-moderate OCIs, house brands are proven to be every bit as capable and while your engine will never know the difference, your wallet will be thanking you.
Or, if you do feel compelled to buy the top-end lubes, then start doing UOAs and slowly extending your OCIs to a point where you'll get some ROI from the investment.
Or, ignore this advice, go with your gut rather than your brain, and continue to waste money; that's what most BITOGers would do!