Highest xW-20 Viscosity @ 100°C?

[CarbonSteel]

I see Red line with 9.1; is there any higher? Conversely, what is the highest viscosity @ 100°C that can still be called an xW-20?

TIA!

 

[PimTac]

Viscosity Charts - Bob is the Oil Guy

Viscosities can be related horizontally only Viscosities based on 96 VI single grade oils. ISO are specified at 40°C AGMA are specified at 40°C SAE 75w, 80w, 85, 5w, & 10w specified at low temperature. Equivalent viscosities for 100° & 210°F are shown SAE 90 to 250 and 20 to 50 specified at...

www.bobistheoilguy.com

 

[CarbonSteel]

Viscosity Charts - Bob is the Oil Guy

Viscosities can be related horizontally only Viscosities based on 96 VI single grade oils. ISO are specified at 40°C AGMA are specified at 40°C SAE 75w, 80w, 85, 5w, & 10w specified at low temperature. Equivalent viscosities for 100° & 210°F are shown SAE 90 to 250 and 20 to 50 specified at...

www.bobistheoilguy.com

Thanks Bud--forgot about those

 

[ZeeOSix]

I see Red line with 9.1; is there any higher? Conversely, what is the highest viscosity @ 100°C that can still be called an xW-20?

TIA!

Per SAE J300 (the official definer of motor oil viscosity ratings), it shows SAE 20 must be 6.9 to
So 9.1 cSt is almost at the thick end of SAE 20.

SAE J300 | Widman International SRL

www.widman.biz

 

[CarbonSteel]

I am playing around a bit with Widman's calculator and RGT. I scored 115QTs of 0W-20 and 60QTs of 5W-30. The middle mix (2QTs of 5W-30 and 3 QTs of 0W-20) is a nice blend and makes a very thin xW-30 or a very thick (just out of the viscosity range) xW-20:

 

[bbhero]

I would go by HTHS... More straight forward that way. And at 150°C it is what oil temps are in the bearings.

I think Mobil 1 EP 5w20 has a HTHS of 2.7. One of the "thicker" 20 operating temp viscosity oils.

 

[CarbonSteel]

I would go by HTHS... More straight forward that way. And at 150°C it is what oil temps are in the bearings.

I think Mobil 1 EP 5w20 has a HTHS of 2.7. One of the "thicker" 20 operating temp viscosity oils.

Unfortunately, I have not found those values posted anywhere for RGT, so cSt is the only other common number between the two oils which is available.

 

[4WD]

Unfortunately, I have not found those values posted anywhere for RGT, so cSt is the only other common number between the two oils which is available.

Well, there is always the “unsurpassed wear protection“ claim …

 

[OilUzer]

I would kill two birds with one stone and move up to a non a3/b4 xW30 if I were in search of the thickest xW20.

 

[CarbonSteel]

I would kill two birds with one stone and move up to a non a3/b4 xW30 if I were in search of the thickest xW20.

I have too much RGT in 0W-20 and 5W-30 to do that. I will just blend it and use it in the Jeep and Explorer.