A dealership sells a large set of distinct products that change every week. The used pickup featured on Monday may be sold by Thursday, a trade-in arrives with no photos yet, and a factory allocation lands in a batch. Meta can turn that moving stock into ads automatically, but only when the catalog reflects what is parked on your lot right now. When the feed lags, you pay to show a vehicle nobody can buy, and the shopper who clicks remembers the disappointment rather than your name.
Interest is created, not captured
Search ads meet someone who already typed a model name. Facebook and Instagram reach people earlier, while they scroll past friends and videos with no plan to shop. That makes the creative, the offer framing and the follow up matter more than on search. A good account treats social as the place where a family starts considering a third row or a commuter starts noticing hybrids, then keeps those people close with retargeting until they are ready to raise a hand.
Several departments, several audiences
Sales, pre-owned, service and parts each want something different from the same page. Mixing them into one campaign blurs the signals Meta learns from. Separate objectives, audiences and reporting for each department keep the variable operations spend from hiding inside the new car numbers.