Well last I checked this was what is in M1 0W40:
The unused lubricant was found to contain a complex mixture of alpha olefins, several specific alkyl diphenylamines, a complex mix of C26H40 alkyl naphthalenes, 4,4′-methylene-bis(2,6-di-tert-butylphenol), and a range of alkanoate esters of 1,1,1-tris(hydroxymethyl)propane (1,1,1-TMP) (Fig. 2).
It's amazing what is posted on the internet.
The paper is dated 2006 and is titled: "IN SITU LUBRICANT DEGRADATION IN ANTARCTIC MARINE SEDIMENTS. 1. SHORT-TERM CHANGES"
http://www.setacjournals.org/perlserv/?request=get-document&doi=10.1897%2F05-015R.1&ct=1
The purpose of this study was ecological in nature. They measured/identified the base oils in two oils, Mobil 1 0W-40 and Fuchs Titan GT1. I'll just highlight the M1 findings.
Quote:
The unused lubricant was found to contain a complex mixture of alpha olefins, several specific alkyl diphenylamines, a complex mix of C26H40 alkyl naphthalenes, 4,4′-methylene-bis(2,6-di-tert-butylphenol), and a range of alkanoate esters of 1,1,1-tris(hydroxymethyl)propane (1,1,1-TMP) (Fig. 2).
If that's Greek to you, that means multiple PAO base oils, multiple alkylated napthalenes (Group V oil), and multiple TMP esters.
The butylphenol mentioned in the quote is an antioxidant, not a base oil.
That's a very nice base oil mixture which is no surprise because the specs that this oil meets are some of the toughest to meet. So there we have it, Mobil 1 0W-40 uses a Group IV/V mixture.
This was origanaly posted in a thread on this site. I got in trouble for reposting this thread because I guess some guys acted poorly and it was locked. I had no idea youc ould not re-post locked threads. So I went into the thread which I had to dig through like 85 pages to find again. This is just the information and not of the bad stuff that got the thread locked!
I know this is kind of old but M1 0W40 has been in continued production and use by the same OEM's since it's inception! It has not suffered the many reformulations we ahve seen with the rest of the stuff. Their was no need and this oil was built specificly for Mercedes Benz to begin with so it is likelynot to have changed. We know that they switched the rest of the oils over to AN in place of ester's but I think they kept them in the 0W40! It is the ester content that allows them to make the claim on the web page that it cleans sludge and varnish out of engines left behind from other oils! Take out the ester's and this oil would not be able to clean anything out!
So I respectfuly disagree with Doug Hillary on this matter! M1 0W40 does have ester's in it. We have zero proof or reason for a formula change in fact this product has been the most consistent with it's behavior since they brought it to market! I think that is due to them leaving it alone!
The unused lubricant was found to contain a complex mixture of alpha olefins, several specific alkyl diphenylamines, a complex mix of C26H40 alkyl naphthalenes, 4,4′-methylene-bis(2,6-di-tert-butylphenol), and a range of alkanoate esters of 1,1,1-tris(hydroxymethyl)propane (1,1,1-TMP) (Fig. 2).
It's amazing what is posted on the internet.
The paper is dated 2006 and is titled: "IN SITU LUBRICANT DEGRADATION IN ANTARCTIC MARINE SEDIMENTS. 1. SHORT-TERM CHANGES"
http://www.setacjournals.org/perlserv/?request=get-document&doi=10.1897%2F05-015R.1&ct=1
The purpose of this study was ecological in nature. They measured/identified the base oils in two oils, Mobil 1 0W-40 and Fuchs Titan GT1. I'll just highlight the M1 findings.
Quote:
The unused lubricant was found to contain a complex mixture of alpha olefins, several specific alkyl diphenylamines, a complex mix of C26H40 alkyl naphthalenes, 4,4′-methylene-bis(2,6-di-tert-butylphenol), and a range of alkanoate esters of 1,1,1-tris(hydroxymethyl)propane (1,1,1-TMP) (Fig. 2).
If that's Greek to you, that means multiple PAO base oils, multiple alkylated napthalenes (Group V oil), and multiple TMP esters.
The butylphenol mentioned in the quote is an antioxidant, not a base oil.
That's a very nice base oil mixture which is no surprise because the specs that this oil meets are some of the toughest to meet. So there we have it, Mobil 1 0W-40 uses a Group IV/V mixture.
This was origanaly posted in a thread on this site. I got in trouble for reposting this thread because I guess some guys acted poorly and it was locked. I had no idea youc ould not re-post locked threads. So I went into the thread which I had to dig through like 85 pages to find again. This is just the information and not of the bad stuff that got the thread locked!
I know this is kind of old but M1 0W40 has been in continued production and use by the same OEM's since it's inception! It has not suffered the many reformulations we ahve seen with the rest of the stuff. Their was no need and this oil was built specificly for Mercedes Benz to begin with so it is likelynot to have changed. We know that they switched the rest of the oils over to AN in place of ester's but I think they kept them in the 0W40! It is the ester content that allows them to make the claim on the web page that it cleans sludge and varnish out of engines left behind from other oils! Take out the ester's and this oil would not be able to clean anything out!
So I respectfuly disagree with Doug Hillary on this matter! M1 0W40 does have ester's in it. We have zero proof or reason for a formula change in fact this product has been the most consistent with it's behavior since they brought it to market! I think that is due to them leaving it alone!
