i regularly fill up with Shell 93 octane gas. once every three or four fill ups i use regular gas (87).

When this occurred, i was running near empty (40 mi. range) with the 87 gas in the tank. so what i did was i filled up with the 93 yesterday, and soon after the SES light went off and the car appears to be running okay now.

Ive never used a fuel cleaner but everyone seems to swear by this Techron stuff... should i add some?? Although not required, people seem to recommend an oil change about 600 miles after adding the cleaner. I just got an ($150) oil change last month. what do i do?

-P