Diamond of Doom

Diamond of Doom is what most mechanics and vehicle technicians call a Renault. This is due to the Renault logo being a diamond, and usually they are broken causing doom and gloom for the owner. Can also be called the Diamond of Death as well!

Gaffer: We've just a Ford come in that needs a new clutch

Technician: No problem, I'll start it as soon as I've finished changing the brakes on the Diamond of Doom