My turbo timer works great. IMHO they are a good idea as when I was flying I ALWAYS idled the turbo's for at least 2 minutes post landing taxi and parked. True, the engines were petrol but boy did they glow at night! We don't just shut off the tractors (all but one turbo'd) either, let them idle for a few minutes before shutting down.

Could well be a 'wisetale' or carry over from father but so far no issues with installed turbo's ... only issue is waiting for the UFI 18g ...