I have a question as to the comparison of data gathered using test method ASTM D4741 against data gathered using ASTM D4683.
I like to compare data.....but I start asking questions when the data is gathered using different test methods.
I looked at the ASTM website....and they are different methods.....but I don't know if the comparison between the 2 data methods would be valid.
Of course..I understand......like the "base oil" factor.....this is only 1 specification of a motor oil.....not the all deciding factor.
Today, I visited the websites for the oils listed below.....and gathered this data.
I only looked at 5W-20 and 5W-30 oils....
Royal Purple did NOT list the HTHS value
Motorcraft did NOT list the ASTM method
Redline used ASTM D4741 method
The others used ASTM D4683
5W-20
Redline 3.3
Mobil 1 2.62
Mobil 1 EP 2.7
Pennzoil Platinumn 2.6
Motorcraft syn/blend 2.65
Amsoil XLF 2.7
5W-30
Redline 3.8
Mobil 1 3.09
Mobil 1 EP 3.1
Pennzoil Platinumn 3.1
Motorcraft syn/blend 3.2
Amsoil XLF 3.2
Amsoil ASL 3.2
I like to compare data.....but I start asking questions when the data is gathered using different test methods.
I looked at the ASTM website....and they are different methods.....but I don't know if the comparison between the 2 data methods would be valid.
Of course..I understand......like the "base oil" factor.....this is only 1 specification of a motor oil.....not the all deciding factor.
Today, I visited the websites for the oils listed below.....and gathered this data.
I only looked at 5W-20 and 5W-30 oils....
Royal Purple did NOT list the HTHS value
Motorcraft did NOT list the ASTM method
Redline used ASTM D4741 method
The others used ASTM D4683
5W-20
Redline 3.3
Mobil 1 2.62
Mobil 1 EP 2.7
Pennzoil Platinumn 2.6
Motorcraft syn/blend 2.65
Amsoil XLF 2.7
5W-30
Redline 3.8
Mobil 1 3.09
Mobil 1 EP 3.1
Pennzoil Platinumn 3.1
Motorcraft syn/blend 3.2
Amsoil XLF 3.2
Amsoil ASL 3.2