Never heard of that risoline I use lucas its a oil stablizer it helps cars that burn oil it slows down the oil burning. We used to sell it at the saturn dealer I worked at. Works good. As far as the rings burning up they dont do that I have taken apart alot of these engines and what I have seen is they have two small thin oil rings a top and bottom one with a baffle between them to keep them seperate. What happens is they get stuck in the retracted postion so they dont scrape the cyclinder wall so good anymore and allow oil to get into the combustion chamber and burn. If ur o2 sensor has never been changed then I would say it wouldnt hurt to get one its bad by now with the oil burning and age.U can get one where u have to wire it in if ur handy with wires and have stippers and crimper pliers. Iam intrested in in ur temp gauge u say it never moves off cold does it move at all?If ur coolant temp sensor is bad it could greatly affect ur emissions make it run rich.I would change it just because its common for them to go bad.I belive ur car only has one sensor the earlier ones have two. Just make sure u change the one with two wires it will have a black wire and a yellow wire going to it. Its screwed into the head below where the upper hose goes. When u change it make sure u get a brass tipped one the plastic tip ones crack and leak coolant into the the connector. When u take the old one out see if its cracked. There under 20 there pretty cheap. Also u could have a thermostate stuck open not allow ur car to get to the proper temp another thing to look into I have had that happen before. If its never been changed which I doubt it has I would change it too. Also have that cat checked out. Let me know what u find.
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Tuesday, February 2nd, 2010 AT 1:09 PM