I don't agree with that 'cause if I fully restore an engine it should be the same as new and mileage shouldn't affect car value. the only difference was the higher mileage). I've also noticed (if I'm not wrong) that car value also depends from mileage (I've sold four 100% restored RX-7s for 103K and an identical 100% restored RX-7 for 68K.
I'll also make cars pics to show my finished works (I nearly never go for liveries, I don't like them). Infos include car name (in-game and real), type (original, modded, DLC), engine type, mileage and values (engine, restoration bonus and car total), so you can see what cars are more worth to restore exc. Car variants like xTEK, S, F-Mill, SUPERCHARGED and so on will not be on this sheet for now. I've also download and tested all (or most of) the modded cars I've found here, so they'll be in the sheet too (with reference to modders and Steam discussions). So I thought it could be useful to make a sheet with these car's infos, updating while I'm working on them, because I still haven't found something like this.
My final goal on CMS2018 is owning all cars restored at 100% and store them in the parking.