Stop in for a cup of coffee

at 212 *F viscosities are roughly
8.4 centistokes for a 5W-20
10.4 centistokes for 5 or 10W-30
15.6 centidtokes for 10W-40

at 180 *F
14 centistokes for a 5W-20
which is why it was recommended for use only when air temperatures were consistantly under 10* F