I dont recommend 15w-40. I had a 1991 Celica with 160K it was pretty sick I regret selling it but got a 2002 Celica and love this one as well. I used Castrol GTX High Mileage 10w-30 with my old celica and my new one. I have always used Castrol 10w-30 with my Toyotas and havent had one problem with them. Clicking noise could be shocks are shot. You A/C compressor could be out because of the car being so old but I could be wrong so best thing would be to do is have someone check it out and see whats going there it could be a simple fix. You could also change the spark plugs, wires, rotor, distributor cap, fuel filter. Is your car a stick shift? Either way you could put in a air intake and get a couple more horsepower out of the car cheap ebay one could do the trick.
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