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60k with the original tires? Several people complained at the board need to replace the tires after 20-25k miles. Either the previous owner drove very carefully, or he used other set of tires and put the Eagle LS back before selling the car.
The 2000 GS my wife drives have only about 7.5k - too early for major maintenance. However, our second car, a 98 Malibu, have the same long-life coolant, plugs, and the transmission liquid.
According to GM, the transmission liquid need not to be changed at all with regular use, and not earlier than at 50k miles with severe use, like taxi or driving in the mountain terrains. This is with Malibu, not Regal - check your the car manual.
I live in Connecticut - a hilly place, but not mountains. However, mechanics are recommending to change the liquid at about 30k. I checked with a Chevy dealer and the Firestone mechanics, the both are very reputable, and was told the same at the both places.
So I changed the liquid at about 40k. Turned to be, for the long-service GM makes a premium transmission filter, costs about $80 (US). My mechanic was surprised by the price.
I asked the mechanic to fill the transmission with synthetic transmission fluid. Mobil 1 ATF. Bought it at Pep Boys, $6 per quart, and brought to the mechanic. Probably ATF this is overkill with the Connecticut climate, but the extra expense is relatively small comparing with the cost of transmission. Makes more sense with the cold Canadian winter.
The orange coolant service is 150k miles (100k with Regal?), or 5 years. My 98 car was built in 97, already 4 years old, and I am planning to change the coolant with 45k mile service, at fall. For the build date, check the sticker on the door jamb.
I believe, it is better to replace the platinum plugs with the 60k mile service. Even while they will serve to 100k according to GM.
Other service items are listed in the car manual. At 60k, any car, most probably, needs new fuel filter, air filter, PCV valves(?), serpentine belt, and the general check-up. Probably needs new brake pads, probably air condition check-up, probably some new wires and hoses, possible injectors cleaning.
Specific for GS: supercharger (a special oil must be added every 30k miles), and the cabin (pollen/dust) air filter.
Tires: see the user surveys at tirerack: http://www.tirerack.com/tires/surveyresults/index.jsp
Personally, I would go to the Firestone Firehawk SH-30. Installed them on my Malibu the last fall and like the riding very much. Especially good at rain, and this is important for safety. Low noise. The best tires in high-performance category according to the user survey:
However, the high performance tires are more stiff. The tires more comparable with the original Eagle LS are listed here:
I believe, all 3-5 top models are good enough.
They claim it boosts horsepower and gives better gas mileage. I wonder if it really works.
The best addition to improve MPG has been the addition of a K&N filter and pulley!!!Good luck with YOUR GS plans
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