Quote:
Originally Posted by Red__Zed
I apologize if my comment caused confusion. I meant it behaves as a cold 5W oil, giving it a (slightly) higher viscosity. I guess I should have fleshed that comment out more.
Not sure where you get the 60cSt number. It's usually below 20, at least for a 5W oil.
Viscosity Charts |
Because it isn't an SAE-5 oil, it is an oil blend. A 5W30 isn't going to perform the same as a SAE-5 or an SAE-30, most of the time it is somewhere in between. It's properties are such that it can pass the minimum test for SAE-30, however there actually isn't any standardized test for Winter weight and most oils certainly wouldn't pass the test of SAE-5.
The viscosity numbers quoted (60 cSt @ 100F) is an average from actual manufacturer test data. On a cold start on a cold day it will be slightly higher, probably around 80-90.