Don't look a gift horse in the mouth. Don't check the dipstick of a gifted car.

They have the same meaning that you're trying see if the horse is healthy and the car's engine is in good condition.

To update replace all with car.

Dont look under the hood of a gift car.

Buckle up.

Hold your engine.

Get out of your limousine.

Turn the key on a drowned engine.

Great examples! 'champing at the bit' also comes to mind. I think cars fill in pretty nicely as a horse substitute. 'Saddle up' has 'buckle up'. Hold your horses has 'Hit your brakes'. As for gift horses... 'Don't look a gift car under the hood?' Hmm doesn't quite work

Don’t look a gift horse in the mouth. Who tf gets a gift horse?

A buddy in college accidentally said “gifted horse“. Then his girlfriend said “very much so” and we never let him hear the end of it

Quit horsing around. You're really putting the cart before the horse.

Edit: sorry, gotta go. I need to see a man about a horse.

I'm sure there's something there with e-scooters. Get off your segway max extreme and get down here. Don't look at the speed regulator of a free scooter. Hold onto your brakes? Idk I'm just spitballing here

I dunno. Yamiks still beats on horses... In both ways.