I'm facing the same thing this weekend - winterizing my trailer. I think you'd be OK as long as there is no residual water in the line. However, the stuff is cheap, so your peace of mind may/may not be worth another gallon of pink.
1990 Nissan 300zx - Castrol Edge Euro 0W-40
2004 Nissan Quest - Pennzoil Platinum Euro 0W-40
2003 Ford Excursion 7.3 PSD - Mobil 1 TDT 5w-40