So, in a year you're running perhaps 15k km (less than 10k miles), and possilby less?
Your initial question was about CI-4 vs CJ-4, but overall, I think the topic more prudent to discuss is your OCI plan.
Why not choose a quality product, and leave it in all year? You will be grossly under-utilizing the oil you choose if you don't.
My point is that 5k km OCIs with ANY product is a bit wasteful. Why are your oil changes costing so much? Because you're using synthetics. Most people are under the impression that using a top-end product, and changing it quite often, is somehow "better" than a "normal" oil changed under a "routine" OCI. But actually, the facts show otherwise. When used for "normal" OCI durations, there is little to no wear reduction when using premium products over conventional products. The UOAs are very telling in that manner. I can show you many UOAs that support this conclusion. And I would challenge anyone to show me a UOA that (excluding defective conditions) gives the return equal to the investment, under those parameters, for PAO products.
Here's my UOA from last month:
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1628772#Post1628772
I ran 10w-30 Rotella year round. Get's below zero degF occasionally where I live. Get's near 100 degF in my summer towing conditions. How much "better" does anyone think an Amsoil product would have done? For my 6k miles (nearly 10k km) I got outstanding wear protection, and spent only $23 for the oil. The oil could have easily gone further, but I dump it once a year to comply with warranty conditions.
If you spend 4x the money for a "premium" product, do you get 4x less wear in "normal" OCIs? No, you do not. And I can't find one single UOA that suggests you would. Do you get 4x the OCI duration? Quite possible - but
only if you make it last that far. So if you purposely limit yourself to shorter OCIs, and you don't get "better" wear protection, where's the logic to spending all the extra money?
I'm trying to help you, and others, understand that for "normal" OCIs, there is no realized benefit to using top-end costly products; it's a false assumption of "better". The facts show otherwise.
I'll concede to the fact that you see some really cold temps, and therefore a dino product might not be a great choice. My suggestion is to run a group III that doesnt' cost too much, and OCI once a year. My suspicion is that RTS or some other moderately-priced group III is available, and you could run it all year with no issues whatsoever. I know from D-Roc that there are plenty of good Canadian-based brand choices that would fill this niche as well.
The Delo 5w-40 you have in there right now is also an excellent product. You could cut your costs by utilizing it to the full extent for the whole year, and be confident in the protection it provides!