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For oil consumption - that is a little harder to assess over the phone and even in person. Compression test is not a bad idea in buying any car - same with Carfax.
Sooty deposits are found on well running engines as well as poorly maintained ones. Could always just flat-out ask if they know of an oil consumption issue. Ask for past maintenance records, previous work orders. Oil consumption is a tricky beast, as some cars that previously had no history or indications of oil consumption suddenly become oil burners. Most of the time, maintenance intervals and type of oil used are the keys.
There are a few out there running synthetic motor oil and good filtration changed at regular intervals have oil consumption, but I'm willing to speculate that is a small number of people. Later 8th gen Corollas (2001-2002) with 4-speed automatics or 5-speed standard seem to be not quite as prone as the earlier ones for oil consumption. My own 2002 has about 180K miles on it, bought new, switched over to synthetic after the initial break-in - zero oil consumption. I run extended oil changes, backed by periodic UOAs - also run mixed driving of 70/30 (hwy/city) on average. There are others with even greater mileage with zero oil consumption - just depends on matching the maintenance to the conditions.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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