Compression Test Results - How much life is left in this motor?

[pitchblende]

Hi,

Car is a 2000 Toyota Corolla. Compression ratio is 10:1, 175K miles on odo:

Cylinder: PSI
1: 185
2: 165
3: 135
4: 165

With these huge variances and #3 being extremely low, what is your guess as to how many miles are left? Car gets consistent mileage (~33 combined, 60/40 city/hwy), no oil leaks, but burns a quart approx every 500 miles.

Probably will donate this car to charity, but looking for a ballpark number.

*Thanks in advance*

[initiation]

according to my calculations and years of experience, you have 1,453,297,297 life left in that car

[Numbersix]

Impossible to say without knowing more.

Do a leakdown test and a wet compression test and get back to us.

[GoFaster]

It could run like that until the end of time, or it could blow up tomorrow. There's not really any way to predict this.

If you have emission testing in your area, the next test failure will probably be the end of it. Pumping that much oil through the catalyst is certainly not good for it.

[Nateblizzy]

It's a Toyota, so another 100K or so. The compression numbers will eventually balance out.

[roadtripper]

only 825K to go. it's a toyota.

(upon which time it will unintendedly accelerate itself into a ditch and explode. you have been warned.)

[pitchblende]

Thanks NumberSix. I figured that the numbers are so bad that it wasn't worth figuring out a root cause via leakdown, as the cost of engine repair/replacement would certainly not be worth it. So it sounds like compression numbers alone aren't enough to answer the question... I was wondering whether it was a matter of weeks, or months, or perhaps longer...