Firstly congratulations and are you happy about the promotion and overall pay rise etc? If yes, then roll with the extra car bonus, but yes there could be some minor tax implications.
I've had issued company cars that had no tax impact, a novated lease that had FBT costs that I would never do again, to a finance lease that for me seems to work in my favour.
If they're issuing you with a car, ask the payroll department what if ant FBT implications you might incur. In the scheme of the overall package, it shouldn't be much, but better to know up front.