Motor oil article

OK, I think I see the misunderstanding. When you wrote:

I thought you meant that the oil has lower viscosity at lower temperature, and increases in viscosity with increasing temperature. So you meant that it has lower viscosity at lower temperature compared to a single grade summer oil, and increases to a higher viscosity compared to a single grade SAE xW oil with increasing temperature?

If so, sorry for presuming that you didn't mean that, when it wasn't completely clear what you meant.

 

Even 0w-20 synthetic ?
So then is it possible to avoid wear at startup?

 

What makes you think that's a problem? If it were, every Prius engine would be very short-lived.

 

Block heater usage before cold starts might help. With an oil pan heater maybe more.

 

Seems like a good idea especially in cold climates if in fact there is wear upon startup which makes sense if there is .
Just wondering
Does the type of gas you use increase or decrease wear upon startup?
Thanks

 

I don’t think so.

 

Yes, for example, Mobil1 0W-20:
https://www.mobil.com/en-US/Passenger-Vehicle-Lube/pdsdownload/NA-US-Mobil-1-0W-20?p=1
has a viscosity five times higher at 40°C (43 mm^2/s) than at 100°C (8,1 mm^2/s).

At 40°C, a 0W-20 is over twice as thick as a 20W-50 at 100°C:
Mobil Special 15W-40 and 20W-50