Changing Engine Oil

The oil drain plug is a 15mm plug, ( need 15mm wrench/socket)) the filter wrench size is a medium.

Here is a guide to walk you through the steps

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

ENGINE OIL TYPE

Look for Two things:

1.GM6094M Your vehicle's engine requires oil meeting GM Standard GM6094M.

2.SAE 5W-30 is best for your vehicle. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 20W-50. Oils meeting these requirements should also have the starburst symbol on the container. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). You should look for this information on the oil container, and use only those oils that are identified as meeting GM Standard GM6094M and have the starburst symbol on the front of the oil container.

NOTICE: Use only engine oil identified as meeting GM Standard GM6094M and showing the American Petroleum Institute Certified For Gasoline Engines starburst symbol. Failure to use the recommended oil can result in engine damage not covered by your warranty.

ENGINE OIL ADDITIVES

Do not add anything to your oil. The recommended oils with the starburst symbol that meet GM Standard GM6094M are all you will need for good performance and engine protection.
Capacities

Engine Oil with Filter .................... 4.8 quarts (4.5 liters)

NOTE: All capacities are approximate. When adding, be sure to fill to the approximate level. Recheck fluid level after filling.

Please let us know if you need anything else to get the problem fixed.

To perform an oil filter change what size wrench to I need for the 3.5 ltr Saturn engine?

Also, the location of the oil drain plug and the type of wrench needed for the plug.

Thank you.