2k miles.
While a pint every 1000 miles is starting to be a little heavy for a modern engine, it may still mean the engine has a couple of years left in it before it starts to display other wear problems. Having said that, unfortunately from what I've read here, Oxygen sensors can suffer from carbon build-up in the exhaust, so if your car is still returning about 22 mpg around town and
30 ish on the hiway, the O2 sensor is probably OK.
Putting heavier grade oil or viscosity enhancers in the existing oil is not a good idea IMO as other areas of the engine which are not worn as much will suffer. Also its wise to change the oil and filter at shorter intervals, say
2000 miles, to stop the oil from becoming overloaded with contaminants due wear. Once an engine is worn, a viscous cycle can start if the owner still changes the oil at longer intervals. Basically the premature dirty oil accelerates engine wear and can produce sludge, especially if the t/stat is allowing the engine to run too cold.
Not sure if that's decent or not. How much does a compression test usually cost?
Not much. It takes about 20 minutes to do. Its of limited use as we already know the oil-rings and possibly bore-wear in the cylinders are not like new. That test will help in determining how much blow-by is occuring (gas escaping past the compression rings into the sump/crankcase. A blowby check which can be done by removing the PCV-valve *once the engine is hot*, and observing any fumes coming out of the cam-cover. If the fumes are heavy, then the expexted life of the engine is reduced. In heavy fuming motors, the pistons can overheat on long trips causing the alloy they're made of to change the piston-bore clearance in extreme cases. If the fuming is hard to see, then its not that bad.
That sounds like a good idea to check how much life it has left. To be honest /w u guys, the car's been in the family for about 10 years so I guess you can say it's sedimental value. In other words, I dont mind spending a few hundred or even a thousand if necessary. My temp guage works fine as does my radiator since that has been recently replaced. When I drive in outdoor temps of 32º or lower, the engine gets soo cold, the guage goes right to the bottom and therefore shifts from 4th gear to 3rd.
That indicates the thermostat is not regulating coolant temperature properly. I 'd spend the money on a Toyota replacement t/stat as some of the cheaper ones are a bit of a toss-up. I've had 2 such aftermarket t/stats fail to open. One did this after initially working OK. A properly working t/stat will control coolant flow so the engine temp reaches normal despite below freezing teps. It will take a little longer though.
Please correct me if I got the gear order wrong. It goes from overdrive to non-overdrive. Is that normal? Once again, thanks everyone for your advice/suggestions.
Sounds correct. The transmission blocks Odrive until proper engine temp is achieved. A higher revving motor (due to being in 3rd rather than ODrive) will heat-up faster.
Jason