First- a short story:
And now, you'll experience the same feelings! But with cars in worse mechanical condition!
Featuring a race between two mediocre cars in real awful condition. The race course is directly ripped off of "mountain race", (all credits for the original race course and files goes to the Beamng team). You'll be driving an Ibisu Covet with a blown head gasket. Your opponent would be driving the faster Bruckell Moonhawk, with it's own engine issues (Bad radiator, and probably also air/fuel mixture issues). I fine-tuned the Moonhawk's engine (and radiator) for hours, so the balance is pretty good- Maybe even a bit on the easy side. You can win quite easily if you have a good run, but that Bruckell isn't as slow as it may seem... at least at the beginning.
The picture above is photoshoped and should be used as reference only.
I actually have a bunch of ideas for scenarios featuring cars in bad condition, so this might get some updates in the future.