Does engine oils 0W versus 5W also affects the rate of how quick the oil climbs? By the way, for those who unplugged the oil pump solenoid, the temperature also climbs quicker.

 

0W oil will flow more quickly at startup in cold conditions, providing faster lubrication to engine components but still heat up the same as 5W. 0W would cool down faster because the lower viscosity releases heat quicker but not enough to make a difference.

 

Interesting. The temperature in the mid-Atlantic east coast is often in the 90s in the summer and as humid as Florida, but the only time I have gone above 215°F is when a coolant hose came off when I was driving. How are you measuring your coolant temp?

I have observed that the coolant temp displayed in the AMG menu in the instrument cluster (I had it added to my car by @BenzNinja ) does not match the temperature when I use a scan tool, like LAUNCH Creader, iCarsoft, or XENTRY. So, I am not sure what signal line is being used. And, as has been discussed, the temperature gauge in the IC is regulated to keep the needle steady regardless of actual temperature fluctuations.

 

I'm pondering going back to 0W-40 for the winter because of cold temperature flow. While there is some difference between 0W and 5W, is it significant at temps above 0°F? I'm not sure we even got into the teens last winter.

 

The temperature readings are displayed from the COMAND vehicle menu.

Edit - I just returned from a short trip. Oil temp was at 88°F when I started the overnight cold engine. I drove 2 miles and the oil temperature was passing 200°F. At 3 miles, my destination, the temperature was 210°F. Ambient temperature was 85°F.

 

I see, thanks for letting me know.

Sorry for the confusion but I might have not understood your correctly, if you are talking about the amg menu, it should be showing the oil temperature not coolant unless I read it wrong?

Something to think about. Pennzoil doesn't have 0W though right.

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I forgot who mentioned it but I think it was forum member Surya that concluded after testing, 5W is easier on the camshaft adjusters.

 

I keep forgetting which forum I’m in. On my 2015 SL400, I had @BenzNinja enable the AMG menu screen. On that car, I get oil, coolant, and tranny temps displayed together.

 

Cali states that viscosity affects pressure and pressure affects the cam adjusters. But temperature affects viscosity. So 0W in winter may be similar to 5W in summer.

but you are right about Pennzoil. So, I may just stick with my 5W-40.

 

I see that clears out my confusion thank you.

I see, thanks for clarifying.