Oil weight in warmer climates

[BlackM]

Good day all, I live in a warm climate area and was wondering if anyone runs 20w-50 synthetic oils in such cases?

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[Cz_Ziemniak]

I wouldn't.

In the S197, there was three different weights specc'd for the exact same 5.0, with the heaviest weight being 5w-50 for the track pack, and 0w-20 for the base 5.0GT. Keep in mind this was the first gen of the 5.0, likely looser tolerances, etc etc.

I'd just stick to the 5w30 the mfg calls for. 5w-50 might be fine, but I wouldn't be comfortable telling you that for certain.

 

[AZ_Ryan]

Well, I live in the hottest climate in the US and I run the factory 5w-30. Ive not heard of a different recommendation from Ford for warmer climates. Though 5w-50 was recommended for some track and racing applications on the S550. Not sure about the S650. Just stick to what Ford tells you.

 

[robvas]

I wonder at what temperature 20W50 would be equal viscosity to 5W30 at 110 deg f

 

[Sig Oris]

Good day all, I live in a warm climate area and was wondering if anyone runs 20w-50 synthetic oils in such cases?

Just use what’s on the cap and walk away

 

[LouG]

Just a point on viscosity. While all, say, 5w-30 oils should be the same, their centistoke rating may differ. Centistoke is the tested viscosity of oils at 60C and 100C.
This difference is critical in motorcycle fork oil for example. I've seen 10w fork oils have as much as 50% difference in centistoke rating

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