Howdy, Found a good deal on a 2001 Saturn SL1 5 Speed 4 door. I commute 100 freeway miles a day and want to save on my ’03 GMC Sierra that has 166,000 miles. 109,000 miles Clean Autocheck A/C works great Engine is super smooth & no noises or vibrations up to 5,500 RPM’s TLC it needs: Check Engine Light – EGR Valve (needs to be cleaned or replaced?) Spark Plugs look very old Reverse lights are out 4 tires (Firestone FR380’s on sale now buy 3 get one free) Radio was taken out – needs one Wiper blades Comments? Which Dino oil works “excellent” in these 1.9l engines? Which oil filter? Which spark plugs work best with this engine? Anything to keep an eye on? Thanks much!