1999 Cadillac Seville STS 4.6
Summary:
Luxurious American Tourer
Faults:
I bought this car to repair. The person before me had blown the head gasket and the oil pan was leaking. Also, after driving, I noticed one of the motor mounts was broken, but this is very common in front wheel drive vehicles, especially with 100,000 miles.
After getting the car home I realized that the thermostat had stuck, but I still could not understand why the head was blown. These engines are designed to run for up to 50 miles with no water in them. After further inspection, I found that some moron had put the relays to the radiator fan motors in backwards. If they had not, the engine would have been fine with just a $12 thermostat replacement.
As far as the oil leak goes. The mid-late 90's Northstar engines did have a problem with their oil pan gaskets and plugs, and why they did not issue a recall I have no idea. This is a fairly inexpensive and simple repair though, and from what I understand the newer engines have no problems with it.
General Comments:
After repairing the car I have had no problems. These are very good cars and excellent engines. I have owned several Cadillacs in the past, all with good results.
I would recommend though, if your Cadillac has a Northstar and you notice it getting warmer, immediately turn the engine off.
Would you buy another car from this manufacturer? Yes
Review Date: 24th November, 2007
5th Aug 2009, 13:27
Our 1998 Caddy Seville S.T.S. is good looking, performs like a sports sedan should with 300 H.P. and a lot of grunt through the double digits, and beyond I'm sure.
The paint is holding up well even outside in the sun. Of course I have a TON of wax on the body.
We love driving the S.T.S. and use it for out of town excursions, giving us great mileage, superb ride, and never tired when we arrive at our destination.
Oil consumption is at one quart a 1,000 miles, with odometer registering, 78,000 miles. This is on trips of 500 miles and more.
I just changed to Valvoline Maxlife 10-30 blend engine oil. My last oil change three weeks ago, haven't taken the car out on the road yet. Anticipating better oil consumption on my next trip out of town.
For this high performance sedan, maintenance is very crucial, with oil changes, and coolant changes using, G.M.'s Dexol, and pellets for sure.
If you have one of these great sport sedans, happy motoring!
Al S.