Join Date: Oct 2009
Location: Orange County, California
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My E34 calls for 89 Midgrade but is now requiring higher octane. It liked the 93 available back east on our recent trip, but now it pings on the local 91 in the 2-2.5K rpm range in 3rd gear around town. Fortunately it goes away when cruising on the highways in high gear.
Say what you want, but we used Cosco gas locally and all over the country with good results. The pinging was no different than on Mobil, Shell, BP, etc.
10,400 miles across the US in 46 days, 24.5 mpg, used only 1/4 quart of Mobil 1 15-50 oil! 146K miles now.