I don't know a lot about oil. For most of my driving life, I have used Havoline and Castrol GTX. My dad always used Pennzoil. His vehicles always seemed to smoke and use oil.
I had been using Castrol. My father-in-law has used nothing but Havoline for years. Like he said, you can find Havoline in a lot of places where you can't find others. Very important when traveling. Also, he has never had an oil related problem in his many years of using Havoline.
I have a new 2005 Dodge Grand Caravan. My first oil change, I was away from home and bought Castrol. The one thing I noticed was that it seemed to stay clear longer. I thought that that was a good thing. I found this forum and someone stated, "If it ain't black, it ain't cleaning". My Father-in-Law echoed this sentiment as well. Made sense to me.
The bottom line for me was this: Havline is a good oil at a decent price. This I garnered from the members here based on UOA's and VOA's; not advertiser's hype.
Is Castrol bad oil? No. Is it worth the fifty to sixty cents more per quart I would pay for it at Wal-Mart? NO. At that price, I'm talking $2.50 to $3.00 more per oil change based on my vehicle's oil capacity.
Is Havoline the best oil ever made? Don't know. It will do the job I need it to do at an affordable price. Other oils may be as good, but you are paying a lot for the advertising? The way oil prices have jumped lately, I will keep as much of my money in my pocket as possible.
The other thing I was fortunate enough to learn here is the 3K OCI myth. I think my engine can handle going 4-5K without needing an oil change. I know a lot of people would say "Change every 3k until your warranty is up". I put about 20k per year on my vehicle. My warranty should be up in about another 18 months so I'm going to chance the 4-5k OCI.
Thanks to this forum, another thing I have learned is not to waste my money on expensive oil additives. I am currently using Auto-Rx but only due to the recommendation of those here whom I consider to be more informed and "oil educated".