good cars maintainance and performance wise? the cars i am looking at are Park Avenue, Century, LeSabre, and Regal are they good what about their engines, body, frames and so on.
I personally wouldn't expect 300k out of any car. A Buick or other GM will likely be OK for 150 to 200k if you maintain it properly and do not abuse it. I have 177k on a Mercury Sable and feel I have done well. I have put 350k plus on a couple of diesels (Merceded 300SD and Volkswagen Sporttruck) but they were exceptionally well cared for. If you have to get 200k out of your car, look at a Honda Accord or Toyota Camry.
95-02 Buick Radio Cd Cassette Regal Century Park Ave Lesabre 25742420 OEM PL * , Delphi FS0176 Fuel Pump Strainer - Cutlass Century LeSabre Bonneville Park Ave, KEYLESS REMOTE 93 94 95 BUICK LESABRE CENTURY REGAL PARK AVE 25602667 ABO0303T , KEYLESS REMOTE 93-95 BUICK LESABRE CENTURY REGAL PARK AVE 25602667 ABO0303T , ENGINE COMPUTER ECM PONTIAC BONNEVILLE FIREBIRD GRAND PRIX MONTANA TRANS SPORT, KEYLESS REMOTE 93-95 BUICK LESABRE CENTURY REGAL PARK AVE 25602667 ABO0303T , 1986 BUICK SKYLARK CENTURY ELECTRA PARK AVENUE RIVIERA LESABRE SALES BROCHURE, KEYLESS REMOTE 93 94 95 BUICK LESABRE CENTURY REGAL PARK AVE 25602667 ABO0303T , 1999 BUICK BROCHURE-PARK AVENUE-LESABRE-CENTURY-REGAL, Starter 96 97 LESABRE 97 REGAL CENTURY PARK AVENUE, 95-02 Buick Radio Cd Cassette Regal Century Park Ave Lesabre 25742420 OEM * , 95-02 Buick Radio Cd Cassette Player Lesabre Century Park Avenue Regal 25727521, OBX OXYGEN O2 SENSOR BUICK CENTURY CUSTOM 96-98 3.8L LIMITED LESABRE PARK AVENUE, 1 Front Wheel Bearing for Century/LeSabre/Regal/Park..., Gas Cap Buick 1975-97 Apollo Century Electra Lesabre Park Avenue Regal Riviera, 91 92 93 94 BONNEVILLE CENTURY ROADMASTER PARK AVE GRAND AM LESABRE CASSETTE FM, 96 97 98 99 00 01 02 03 CENTURY LESABRE SKYLARK PARK AVE REGAL RADIO CASSETTE , CENTURY ELECRTA LESABRE PARK DEVILLE FLEETWOOD CELEBRITY Front Wheel Hub Bearing, 95-02 Buick Radio Cd Cassette Player Lesabre Century Park Avenue Regal 09366404, CENTURY ELECRTA LESABRE PARK DEVILLE FLEETWOOD CELEBRITY Front Wheel Hub Bearing, OEM AIR BAG MODULE CHEVROLET BERETTA PONTIAC BONNEVILLE FIREBIRD SATURN S SERIES, ENGINE COMPUTER ECM PONTIAC BONNEVILLE FIREBIRD GRAND AM GRAND PRIX 9380717, OEM AIRBAG CONTROL MODULE BUICK CENTURY LESABRE PARK AVENUE RIVIERA ROADMASTER, 3156 6000K 54-SMD LED Back-Up Lights Buick Century LeSabre Regal Park Avenue #56, Dual Color 60-LED 1157 Parking Signal Lights Buick Century LeSabre Roadmaster#66, Amber 54-SMD LED Buick Century/LeSabre/Park Avenue 1157 Turn Signal Lights #A54, 96-03 Century Lesabre Park Avenue Skylark Radio Tape 2000 2001 2002 2003 #1875, 1 Front Wheel Bearing for Century/LeSabre/Regal/Park..., 95-02 Buick Radio Cd Cassette Player Century Park Avenue Lesabre 09373354, Buick LeSabre Park Avenue Century Cenetr Caps Pair 25551433 ,