Where's the rheostat at? Are the fuses all underneath the hood? I looked for them briefly the day I bought the car, but I've been sort of busy since then.

Also, what octane gas should I use? It was tapping on the way home when I bought it, but then I put in whatever the highest there was at the gas station and it hasn't happened again.

Is oil consumption normal? I haven't noticed any leaks, but when I bought it, I checked the oil and it was a little low. I added a quart and the light went off. It's been about three weeks and today the light came back on. I was thinking about using synthetic oil. I heard that when you start using synthetics on higher mileage vehicles you can develop leaks. Is 109,000 too high to start?

Thanks for the help!

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1988 260e 109,000 miles