Synthetic Takes Longer to Warm Up in Winter?

[Shannow]

Originally Posted By: Gokhan
Thicker oil, because of hydrodynamic reasons, will increase your bearing temperatures and probably also the ring/lining temperatures, after the engine warms up, which is actually a bad thing and one of the disadvantages of using thicker oil.


Thicker than what ?

 

[IndyIan]

I've got no data but I've got to think thicker oil does warm up faster due to the higher resistance to being pumped. A -15C start with 15W40 might have an oil pump dumping 3-4-5hp into the oil until the oil gets some temperature into it.
I guess then the motor warms up faster too as it has to supply the extra hp as well.
I'm not going to switch out my synthetic in the winter for 15W40 anytime soon though. Easier cold starts is more important that a few degrees in oil temperature.

 

[Shannow]

As Caterham says 'though, the thicker oil will provide the same operational viscosity in the bearings as a thin oil, and therefore the same protection to bearing wear.

 

[Bamaro]

Originally Posted By: cp3
This is my morning drive today, 55 minutes total. If this is any indication, it isn't the oil.

Why no X axis values?

 

[cp3]

Because I'm not an Excel pro...lol

It was just cumulative time and with points every 5 seconds or so it looked more messy than it was worth.

 

[Gokhan]

Originally Posted By: Shannow
Originally Posted By: Gokhan
Thicker oil, because of hydrodynamic reasons, will increase your bearing temperatures and probably also the ring/lining temperatures, after the engine warms up, which is actually a bad thing and one of the disadvantages of using thicker oil.

Thicker than what ?

Oil thickness is currently limited to xW-20 because of the existing SAE specifications, while the developing of xW-15, xW-10, and xW-5 and the new SAE specifications is in progress for the future engine generations.

So, the answer to your question is that your bearing, ring, and lining temperatures increase with the increasing HTHS viscosity when you move up from xW-20 to xW-60. You will get the lowest bearing temperature with xW-20.