The size of the oil pan screw for the 2001 Oldsmobile Alero is one half with the threads one eighth inch to 27. The screws can be purchased at any auto parts store.
15 mm
4x6
225/50/r16
i have a 2001 olds alero 3.4 V6 and the thermostat on mine is underneath the throttle body...this may vary from your '99 vehicle, and it also may vary depending on your engine size
If you are looking for the tire/rim size for a 2003 Oldsmobile Alero. It is listed here. Tire Size - 215/60/R15" Rims Size - 15 inches
2.4 I have seen some equipped with a 3400
The factory tire size for a 2004 Oldsmobile Alero is 255-50 R16. These tires can be purchased at stores such as Firestorm or Goodyear.
The 2002 Oldsmobile Alero is typically equipped with 1-inch tweeters. These small speakers are designed to handle high frequencies in the car's audio system, providing clarity and detail in the sound. Depending on the audio package, the Alero may feature different configurations, but the standard tweeter size remains consistent.
Crutchfield.com has a easy to use tool to find out. It asks you the year, make, model, elt... An alero has 6x9 in the rear.
6x9
The Oldsmobile Alero typically features 6x9-inch speakers in the rear. This size is common for many vehicles from that era, providing a balance of sound quality and bass response. Depending on the specific model and trim, there might be variations in the audio system, but 6x9-inch speakers are standard for the rear.
The tire/rim size of a 2003 Oldsmobile Alero is listed right here. Tire Size - 215/60/R15" The rim size is 15 inches, so I am not sure about 20 inches. You might want to consult a Mechanic.