Hi JAG and Tom,
Discussion is really great. Thank you both! Tom’s answers help me to have better understanding of the complexity of the analysis of motor oil.
And now I hope that I have more good news. I think that I have found what we needed – a GC of Toyota 0w20 oil. As I already mentioned in my previous post, I have found the entire document (case study), from which I have taken the examples of Pyrolysis – GC of the Toyota 0w20 oil. Today I had time to read it more carefully and I have found this:
The study suggests that the oil contains organic Molybdenum-Sulphur complex (not sure about the term), PAO, n-paraffins and isoparaffins. Esters are not mentioned.
On the other hand - the commonplace interpretation of the FTIR suggests that the base oil is only VHVI + small amount of esters (absorbance at 722.1 (VHVI) and 1735 cm-1 (esters)). The VOA of the oil also shows slightly higher oxidation value than the usual (22 IR Units) - which is also regarded as an indication of esters (although small amounts) in the oil. Please see the VOA data and FTIR in my previous posts.
Bearing the above in mind – is it possible to conclude that:
1. The oil contains not only VHVI but also PAO base oil?
2. The oil doesn’t contain esters and the peak at 1735 cm-1 on FTIR is coming from something else (Tom suggested earlier that the absorbance at 1735 cm-1 FTIR of the Red Line oil can come from multiple sources)?
I want to emphasize that I'm not trying to judge the quality of the Toyota 0w20 oil. I’m not interested how good or bad is this oil. Because this is a rare situation - VOA + FTIR + GC of the same oil, my only goal is to have a correct interpretation of the GC and differences that it shows to FTIR commonplace interpretation (Tom has already mentioned that his is not an expert on FTIR) in order to clarify (if possible) that:
1. The peak at 1735 cm-1 on FTIR doesn’t always indicate esters (as base oil; Tom’s suggestions about absorbance at 1735 cm-1 on FTIR of the Red Line oil).
2. The peak at 722.10 cm-1 is not fully informative about the nature of the base oil.
Tom, please excuse me for having bothered you with so many questions!
Discussion is really great. Thank you both! Tom’s answers help me to have better understanding of the complexity of the analysis of motor oil.
And now I hope that I have more good news. I think that I have found what we needed – a GC of Toyota 0w20 oil. As I already mentioned in my previous post, I have found the entire document (case study), from which I have taken the examples of Pyrolysis – GC of the Toyota 0w20 oil. Today I had time to read it more carefully and I have found this:
The study suggests that the oil contains organic Molybdenum-Sulphur complex (not sure about the term), PAO, n-paraffins and isoparaffins. Esters are not mentioned.
On the other hand - the commonplace interpretation of the FTIR suggests that the base oil is only VHVI + small amount of esters (absorbance at 722.1 (VHVI) and 1735 cm-1 (esters)). The VOA of the oil also shows slightly higher oxidation value than the usual (22 IR Units) - which is also regarded as an indication of esters (although small amounts) in the oil. Please see the VOA data and FTIR in my previous posts.
Bearing the above in mind – is it possible to conclude that:
1. The oil contains not only VHVI but also PAO base oil?
2. The oil doesn’t contain esters and the peak at 1735 cm-1 on FTIR is coming from something else (Tom suggested earlier that the absorbance at 1735 cm-1 FTIR of the Red Line oil can come from multiple sources)?
I want to emphasize that I'm not trying to judge the quality of the Toyota 0w20 oil. I’m not interested how good or bad is this oil. Because this is a rare situation - VOA + FTIR + GC of the same oil, my only goal is to have a correct interpretation of the GC and differences that it shows to FTIR commonplace interpretation (Tom has already mentioned that his is not an expert on FTIR) in order to clarify (if possible) that:
1. The peak at 1735 cm-1 on FTIR doesn’t always indicate esters (as base oil; Tom’s suggestions about absorbance at 1735 cm-1 on FTIR of the Red Line oil).
2. The peak at 722.10 cm-1 is not fully informative about the nature of the base oil.
Tom, please excuse me for having bothered you with so many questions!
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