Tahoe issue??

[RidgeRunner]

Not very well Aussie, 2001 Tahoe 2WD 5.3L here, wife's wheels. Poor girl it is asking for another change of engine oil, radiator is leaking, then I went to drive it and it feels like the shock on the right rear is broke. I forget the miles around 95,000 ? The Service Engine Soon light stays lit all the time. Some odd Computer Code that is saying their is a problem with the computer. Runs and drives like a top. The light has been on so long I am surprised it hasn't burnt out. So I dropped it off at the repair shop next door. Now if I could get the seat re-upholstered while it is down I would be a hero..
BTW I started using Mobil One 5-30 Synthetic at around 40,000 miles. Then I switched back to regular motor oil at around 85,000 miles. No sign of leaks or burning it out the tailpipe but she now uses 1 Quart in between oil changes (3,500 to 4,000 miles.) Valve stem seals maybe..