High Mileage Maintenance History - What is Acceptable vs Too Risky

Question

Hi,

I'm looking at buying a 2018 AWD Sienna with 140k miles from a car dealership (not Toyota). I've reviewed the vehicle maintenance report and overall it seems pretty good, but there are some questionable points that I am curious what others think. In general, it followed ~5k oil changes intervals, sometimes it followed the Toyota recommended 10k oil change intervals, except for 2 times once where it was 12k and then there's 23k miles with no reported history...the 23k is the biggest question mark to me.

I guess it's possible that the oil was changed during the ~23k miles and there's just no history for it (ex: CarFax didn't have partnership w/that mechanic or it was DIY by the owner). Assuming oil was NOT changed for ~23k miles, would you avoid this vehicle or would you still consider having a mechanic inspect it? If a mechanic inspected it, would an engine pressure check be the best test to see if the engine is in good shape or would you recommend a different test?

I'm not a car expert, but have done a lot of researching lately. Trying to make the best purchase for our family and would appreciate any advice you may have.

Oil & Oil Filter Change Intervals (TD = Toyota Dealership, SB = Small Business):

0 TD
10k TD
15k TD
19k TD
24k TD
28k TD
(35k service done at TD, but no details)
40k TD (12k miles since last oil change)
(40k fuel pump replaced)
47k TD
53k TD
59k TD
(60k serviced at TD, but no details)
(no car history for ~22k miles)
82k SB (23k miles since last oil change)
88k SB
92k SB
99k SB
102 SB
107k SB
112k SB
123k SB
129k SB
139k SB
140k TD

MountainManJoe · Accepted Answer

[quote data-userid="180219630" data-postid="326367"] would an engine pressure check be the best test to see if the engine is in good shape [/quote] I think you mean a cylinder compression, and yeah it's a good data point, but it doesn't tell the whole story. It doesn't tell you much about the condition of the internals (crank bearings etc.). Popping open the valve cover and looking for sludge and varnish would tell you a lot too, but the dealership probably wouldn't agree to that.