Bill, are you talking about the "magic red potion" thing again? That if it costs a whole lot more it HAS to be better? That the magic will ooze out all over the bike and fix cables and such no matter what happens?
It doesn't work that way, no matter how much you need to believe it does because you refuse to do maintenance on your bike.We just went down that road with you over your $13.00 a quart Klotz oil and lo and behold,
it didn't hold any advantage under tests that anyone (including you) could ever identify by any form of testing that anyone could dream up, including you.
The high cost must be magic stuff just doesn't pan out when reality hits it up square and cold .... You still have to do routine maintenance on your bike and you gotta periodically adjust your silly valves for best performance and gas mileage, etc.
Now, synthetic vs dino does pan out with some evidence behind it, but we are talking about two dino type oils right now. IF we were talking about synthetic oils, we would be talking about blue jug rotella T-6 which test out to be competitive to better on features and to be a much less expensive synthetic oil than most.
But that is a different sort of oil war .... This here is a good dino erl discussion.
And dino oils are JEST FINE for a stock Savage engine -- dino oil and a reasonable oil change frequency is list proven to go 51,000 to 76,000 to 120,000 miles on a Savage engine so far.
Yep, one right purty bike (guys can accept terms like purty, "pretty" is too girly for them) and one really pretty bike

Castrol is a good premium brand name of oil.
There is nothing wrong with Castrol and it does cost a lot less than the rest of the $9 a quart bottle JASO MA rated oils that you commonly see in the motorcycle section.
But when you start talking buying in gallon or bigger jugs you can get premium brand name JASO MA rated oils with excellent reps a whole lot cheaper than $3.99 a quart.
And remember, with two scooters he is gonna be killing over a gallon of oil for each scheduled oil change that he does, so yeah, cost does matter some. And that huge 3 gallon jug begins to smell more like a convenient package sized one season oil supply for his two bikes .....