Winter Final Drive Lube Change?? Help!!

Do you guys change your final drive lube in the winter?

It's a tough one for me to call. We've had highs in the 30s and even in the 20s today. But here in NJ it can go up to the 50s for a week or two. These temps straddle the 41 degrees Fahrenheit for changing. I want to ride today in the twenties to test my new Hippo Hands, but I don't want to do damage to the bike. What do you guys do???

Thanks!!
Tom

Below is from the shop manual.


Drive Train
Primary Reduction System:
Type Gear
Reduction Ratio 1.517 (85/56)
Clutch Type Wet multi disc
Transmission:
Type 5-speed, constant mesh, return shift
Gear Ratios:
1st 2.500 (40/16)
2nd 1.590 (35/22)
3rd 1.192 (31/26)
4th 0.965 (28/29)
5th 0.781 (25/32)
Final Drive System:
Type Shaft
Reduction Ratio 2.619 (15/21 × 33/9)
Overall Drive Ratio 3.105 @Top gear
Final Gear Case Oil:
Grade API Service Classification: GL-5 Hypoid gear oil
Viscosity SAE90 (above 5°C),
SAE80 (below 5°C)<<<<<<<<<<<<<<<<<
Capacity 200 mL (6.76 US oz)