15th Dec 2004, 15:07

This may or may not be a stupid comment. You need to make sure you are ussing the proper fuel. The 1991 Eldorado calls for premium. If you use to low octane it will rattle and ping. I run the mid grade fuel with no problems, but the cheap stuff just don't work.

16th Feb 2005, 13:39

I bought my 1991 Eldorado in July of 2001 with 27,000 miles on it. I shopped for a long time and paid top dollar, but I love this car. If you change the oil every 4000 miles, flush radiator once a year and strictly follow the service schedule in owners manual, the car is pretty reliable. I now have 88k miles on mine and I have replaced battery, brakes and A/C compressor. Brakes were scheduled maintenance. Most important is finding a reliable mechanic vice someone who changes all 6 parts in a system. Stay away from dealer's maintenance at ALL times.

Question? Does anybody know how to reset the Change Oil index after I change my oil?


Tampa FL.

30th Jan 2006, 14:57

You can reset the oil life index by depressing and holding two buttons on the Climate Control. Hold them for a few seconds and you will see the oil life index increase in increments. Check your owner's manual for which buttons...

9th Jul 2007, 19:51

I truly enjoy my caddy' most everything that was replaced or repaired is just the course of the life of a car. I just went 800 plus miles on 2 1/2 tanks and consider the ride and horse power worth the price of 91 octane. My" Biarry" has 106k and is just getting to the point of some "major repairs", the ignition switch night mare, power steering pump leak, and new rear speakers, but that's small for the comfort and ride plus handling. And what about mass? There good in a collision..By the way rotors warp from cheap or improper pads and /or not using the transmission "down shifting" on steep grades, or if you ride the brake.

23rd May 2008, 13:26

I am working on my 91 Biarritz at the moment. This thing has a fried manifold and sounds like a beast.

It gets really good gas mileage considering the fact of almost 300 torque, which I use all the time.

This is a one of a kind car, I mean touring coupe, that was in car shows when new.

For your power steering, you can't drive a caddy cold or burn out while turning, otherwise this problem occurs.

My caddy started running at 80 miles an hour on idle one day, and 4000rpm, but there's an rpm regulator by the throttle that went bad, so I tore it out and threw it away, and it's never ran better.

I also love the black sapphire paint and the well built moonroof. Makes me feel like a pimp on Broadway.

This is my 3rd caddy, and I know a lot of their mess ups, which are generally simple.

29th Nov 2015, 03:43

Repairing any car by hit or miss parts replacement guessing is the sign of someone who does not know what they are doing. Particularly when it comes to your Cadillac, because any decent mechanic or even anyone slightly informed about these years of Cadillac's should know it's the on board code reader that allows even a half decent backyard mechanic to diagnose a problem and get to the problem quicker and ultimately cheaper.