Originally Posted By: K23Turbo
Anything and everything from my mechanics shop bulk conventional 5W30 from a drum, to individual quarts and five quart jugs of brand name Synthetic to exotic Syns.
Same here (minus the bulk stuff), depending on the car and the situation.
On my last car, I ran expensive boutique synthetics, first because I had easy access to them (Motul), and later because I had an identifiable problem (fuel dilution) that I thought a specific boutique oil (RLI) could help with. Then, when there was evidence that the head gasket was failing, I switched to Mobil 1 0w-40 because that was the cheapest oil with the correct approval.
Right now, I'm using a big-name conventional because my car is still in warranty and that's the best way to avoid potential headaches if something goes wrong. However, I am using what I think is the best available option based on the meager data out there. And as luck would have it, it's also one of the cheaper options. After the warranty is up, I might switch to a super-niche synthetic if I can find one that has a good chance of being better in the long run, or I might just stick with this oil type and run really short OCIs.
In every case, one or two differences in the context might point to a completely different choice.
That's why I'm not sure how meaningful this thread is. There are so many possible factors in oil choice, a simple tally of what people are using (without any specifics) is uninformative at best and potentially misleading at worst.