diff -r a85bab77cbdd -r 4240f624bca0 vehicle.c
--- a/vehicle.c	Sat Dec 11 09:51:55 2004 +0000
+++ b/vehicle.c	Sat Dec 11 10:17:10 2004 +0000
@@ -22,6 +22,13 @@
 	v->reliability = _engines[v->engine_type].reliability;
 }
 
+bool VehicleNeedsService(const Vehicle *v)
+{
+	return _patches.servint_ispercent ? 
+		(v->reliability < _engines[v->engine_type].reliability * (100 - v->service_interval) / 100) : 
+		(v->date_of_last_service + v->service_interval < _date);
+}
+
 Order UnpackOldOrder(uint16 packed)
 {
 	Order order;