I mean, you clearly do, you sound like you need to take a Xanax at just the thought of bulk oil that you don't know the brand of being used, regardless of it meeting the spec.
You are missing my point entirely. I expect a certain standard of service and I expect to know what I am getting and get what I pay for.
So, if you are paying for an oil change that doesn't list a brand, it's just a $39.99 oil change special that says it uses an oil that meets the required specification, how you are not being adequately served? Sure, if the sign says you get Mobil 1/Castrol/Mouse Milk, then you expect to get that, but many of the "coupon", "conventional" or "bargain" services don't list a specific product.
Luckily for me, I have never seen a dealer just give me "whatever". All were genuine oil types that the manufacturer used, supported and recommended knowingly (yes usually made by Castrol or Mobil, but known and understood ahead of time, not chosen at random) As everyone knows, FCA products are Pennzoil/Shell, BMW at one point was as well, but then went back to Castrol along with Volkswagen/Audi.
FCA used to be Mobil.
What if it's a type that the manufacturer doesn't use? My Ford example from earlier, Ford doesn't have a relationship with Mobil, at all, but this dealer will sell you Mobil products, including Mobil 1. All meet the required performance requirements from Ford (the WSS-xxx) but so do most bulk oils.
Toyota genuine is made by Mobil. Etc. etc. etc. As a matter of fact, you CANNOT just put "whatever bulk oil" into a lot of these new Toyotas because there is NO OTHER OIL like it. TGMO 0W16 for example has over 10x the moly of regular Mobil1 0W16.
Where's the spec in the manual that demands higher levels of moly? There isn't one. Toyota simply calls for API SP in 0W-16, which means you can use Mobil, Shell, Petro-Canada...etc. So yeah, you can in fact use whatever bulk oil in that grade as long as it's API SP.
You think the Toyota dealer is just gonna say screw it and throw whatever they got laying around in that car? NO.
They'll put in whatever meets the spec. Since Toyota doesn't have any specific approvals beyond the API ones, that's not setting the bar very high. Sure, some dealership will advertise that they use only Toyota Genuine Oil, but there are others that don't.
Additionally for those of you trying to make the case that they do this for "profit"? and compete with Jiffy Lube? Are you kidding me? I got news for you, regardless of what kind of oil you use, the profit is roughly the same. ZERO. Dealership business models are vastly different than quick lube places or independent mechanics. They don't skimp on oil to screw you out of a few bucks. Thats what their high labor rates and (sometimes) ridiculous recommendations are for.
You missed the point of this by a country mile. The reason to compete with Jiffy, Walmart...etc is to get you in the door. While you are in for your $39.99 conventional oil change they give your vehicle a "once over" and then recommend new wiper blades, brakes or a brake service, tires, alignment...etc. That's the angle.
If you have a dealer using mystery oil, RUN. That is all I am going to say. Leave a 1 star review on every platform and never return.
Who said it's mystery oil? It's bulk oil, if you ask them who makes it I'm sure they'll tell you, nobody is keeping it a secret. I know Petro-Canada produces it for some Canadian dealers, but Safety-Kleen also sells it, P66 (they make Kendall, Supertech...etc). I'm sure Mobil also makes a bulk product along with Shell and Castrol.
Here's the Pennzoil product. You'll note it meets Chrysler, Ford and GM specs and is API SP:
Here's Pennzoil "Full Synthetic" that isn't a consumer-geared product in 0W-20:
I could dig up many more. These are the type of product used in the bulk tanks.