== == 5W-30 is the Preferred weight. If you would like to keep the engine in the best shape, I recommend using Synthetic motor oil 5w30, in any brand or type (conventional or synthetic) you prefer. It also takes 4.5 qts.
need more information, what kind of Buick and what size engine.
check your manuel
If there is it will need to be flashed by buick to activate the plug
The oxygen sensor on a Buick Rendezvous is located immediately before the converter on the driver's side. You will need either a special socket or a wrench to remove the sensor.
To change the refrigerant in a Buick Rendezvous you will need to remove the old freon. Freon is bad for the ozone, so you will need to hook to a special machine and reclaim it. Next you will need to pull a vacuum on the ac syatem, then fill with new freon.
Could be in need of a tune up. If the "check engine" light is or has illuminated, have it scanned for codes first. The codes will help lead you to the problem.
In order to replace the drivers side mirror on a Buick Rendezvous, you will need to remove the door panel. You will have to disconnect the electrical connector and you will be able to remove the mirror and place the new one on.
Does not have one. Just a coil pack, top of the engine, near the wiper transmission area. Follow the ignition wires. Should not need replacement at all.
vehicle will not start how do I reset the computer you don't need to
It depends on the climate. A 10W-30 would be most common.
You can replace your 1998 Buick 3.8 liter engine with a Buick 3.1 liter engine. You will need to change the motor mounts and some of the wiring harness will need to be modified.
Need to know what year and engine size.