This must be an error on the Amsoil web site..
- Thread starter Alex D
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Maybe a typo, I know they've been changing the specs around lately.
My spec sheet says: 2993cp @ -30°C CCS ASTM D2602
Pump@-40°
pour@-60°
My spec sheet says: 2993cp @ -30°C CCS ASTM D2602
Pump@-40°
pour@-60°
Check the temp where the reading is taken. It will explain it all. Unless Amsoil has opted for a slick marketing company that will just publish spec's without understanding the significant conditions.
Cold cranking viscosity for 0w is @ -35C, for 5w @ -30C, for 10w @ -25C.
Alex,
Current specs for the 10w-30 on the new sheet I have show vis @ -25C is 3097 Cp. The spec sheet for the 0w-30 is up to date, but the one for the 5w-30 has not been updated. It still shows the CCS viscosity tested @ -25C, when it should be -30C ....I'd estimate vis @ -30C for the 5w-30 to be approx 3800 Cp, based on the old data.
For a PAO based synthetic, the general rule is that the CCS viscosity will increase by a factor of 1.7 for every 5C drop in temp. This allows you to convert viscosities to different temps. For a petroleum oil, you multiply by a factor of 2.0 for every 5C drop in temp.
Tooslick
Current specs for the 10w-30 on the new sheet I have show vis @ -25C is 3097 Cp. The spec sheet for the 0w-30 is up to date, but the one for the 5w-30 has not been updated. It still shows the CCS viscosity tested @ -25C, when it should be -30C ....I'd estimate vis @ -30C for the 5w-30 to be approx 3800 Cp, based on the old data.
For a PAO based synthetic, the general rule is that the CCS viscosity will increase by a factor of 1.7 for every 5C drop in temp. This allows you to convert viscosities to different temps. For a petroleum oil, you multiply by a factor of 2.0 for every 5C drop in temp.
Tooslick
I'm a bit confused...should the cold cranking ASTM be ASTM D5293 or ASTM D2602?
What's the diff?
ASTM D5293 is the one with 0w is @ -35C, for 5w @ -30C, for 10w @ -25C.
What does D2602 say?
What's the diff?
ASTM D5293 is the one with 0w is @ -35C, for 5w @ -30C, for 10w @ -25C.
What does D2602 say?
Pablo,
ASTM D2602 is the old name for the ASTM D5293 test protocol - they are exactly the same test....
The standard, CCS test temps did change, when the "SAE J-300" standard was revised (in June of 2001, as I recall). At that time, the standard test temps for all SAE grades was lowered by 5C, and the max viscosity allowable changed from 3500 Cp in most cases to 6200-7000 Cp, depending on SAE grade. For example, max allowable for 0w-xx oils is 6200 Cp @ -35C ...for 10w-xx oils is 7000 Cp @ -25C.
Oil specs are jointly developed by a group composed of the API, the SAE and the ASTM.
API = American Petroleum Institute
SAE = Society of Automotive Engineers
ASTM = American Society for Testing and Materials
ACEA = Euro version of API (formerly CCMC)
DIN = Euro version of ASTM
ASTM D2602 is the old name for the ASTM D5293 test protocol - they are exactly the same test....
The standard, CCS test temps did change, when the "SAE J-300" standard was revised (in June of 2001, as I recall). At that time, the standard test temps for all SAE grades was lowered by 5C, and the max viscosity allowable changed from 3500 Cp in most cases to 6200-7000 Cp, depending on SAE grade. For example, max allowable for 0w-xx oils is 6200 Cp @ -35C ...for 10w-xx oils is 7000 Cp @ -25C.
Oil specs are jointly developed by a group composed of the API, the SAE and the ASTM.
API = American Petroleum Institute
SAE = Society of Automotive Engineers
ASTM = American Society for Testing and Materials
ACEA = Euro version of API (formerly CCMC)
DIN = Euro version of ASTM
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