I was at the same place you are. Bought my X, spent money on it totally resealing the engine to get rid of oil leaks, then BAM, timing chain guide failure. Put in a used engine. Seemingly I'm always wrenching on it, replacing this here, getting rid of squeaks there. But I like it to much to sell it. I agree you'd definitely be better off driving it awhile before selling to get your money back out of it.

Also, wheels and headlights can't be figured in on maintenance money, unless you had bent rims, cracked headlights, etc...

__________________
Current-

--2003 X5 4.6
Estoril Blue
Black Nappa leather
rear air bags
OEM nav
OEM hitch
OEM cargo liner
Black housing SPYDER headlights - Evo-XR projectors

2017 GMC Sierra, 7K miles...
2017 GMC Sierra, 60K miles...
2015 GMC Sierra 280K miles...
2011 GMC Sierra, 500K miles...

Previous wheels:

--First love~
1969 Chevy C10, 396BB bored, 3 on the tree, Black ~SOLD~

--2011 Chevy Silverado LT 2500HD CCSB, Black, 250K miles ~SOLD~