In Reply to: Do I need to use premium fuel in my 1995 540i? posted by Lon on March 27, 2000 at 14:02:46:
With a compression ratio of 10:1 you are committed to using premium if you want your engine to live a long and healthy life; nothing you can do about it.
The 530i is 10.5:1, even worse.
Pinging can damage the engine over a long period of time w/o being audible. There are knock sensors to detect this, but they allow some pinging to occur before they actually take temporary and only partially effective action.
Gas is cheap - ever checked your depreciation?