There's no sense in opening a garage expansion by leveling instead of good 'ol buying in the first place, but also the way you earn XP is broken, like, you get about 100 and some small bonus wherever you had to dig through the entire engine bay or just change the oil, in the first case you'd get about 150-200 xp and in the second - ~110 xp, so there's absolutely no point in taking a hard tasks, just take the easiest ones again, and again, and again.
This game is nice from the technical point (not at graphics or performance, though they aren't bad, but I mean the car's engines simulation, This game is nice from the technical point (not at graphics or performance, though they aren't bad, but I mean the car's engines simulation, details and labor put into them), but almost trash from gameplay point, it's plainly boring, grinding and repetitive, like a worst android casual games.