I think so, but drones have "more" power than normal, so that they can catch up to you even if you're at top speed.
So even with 1 engine out, they're still a little faster than you would be with 1 engine out, and the few times I do recall RTB with drones leaking oil, they lasted a VERY long time before the engines plain-ol'e quit on 'em.
So, "yes" but with a qualifier that "it's not going to affect you right away"