If one of your squadmates jumps inside a nearby vehicle, you'll automatically repair him - albeit slowly - but without having to jump outside and use the repair tool. You'll not only receive team points for the repair, but this also gives you a healthy teammate.
This increases the chance that both of you will survive in a firefight. Better still, if your buddy is also an Engineer, you'll cross-repair each other continuously - one of the deadliest combinations in the game. Two Engineers traveling in twin formation allow you to defeat even the most skilled opponents with your combined firepower and perpetual regeneration.
If you are being repaired by a teammate and engaging the enemy, it's important to try and remain still while they heal the damage. Running over your mechanic while he's trying to repair you is bad form, in addition to losing you team points.
