And the answer to my color question in another thread.
A delete or edit funtion would be nice.
A delete or edit funtion would be nice.
G.C. on GC GOLD - Base oil analysis
- Thread starter Tom NJ
- Start date
- Status
With the green GC being more of a known entity, I think many folks would say it's superior to the gold GC until proven otherwise. My personal opinion is that they are both excellent and I wouldn't hesitate to use either (and I do use both). Pretty much any GC that you find on the store shelves today is going to be the new gold GC, although there is still some green GC floating around, as well as the older "made in the U.S." non-GC Syntec 0W-30.
Yes, the easiest way is to look at the date code on the bottom. Use the info in the GC FAQ linked below to determine how to read the date code and figure out if you have green or gold GC:
http://theoildrop.server101.com/forums/s...ge=0#Post711450
Good luck with the GC hunt!
BTC an edit is possible.*S*
you have to hit the reply on your post and then at the top menu bar when you see the replypost.php change that to editpost.php and hit enter. Then it takes you to either an edit or delete the post page.
you have to hit the reply on your post and then at the top menu bar when you see the replypost.php change that to editpost.php and hit enter. Then it takes you to either an edit or delete the post page.
Last edited:
Quote:
BTC an edit is possible.*S*
you have to hit the reply on your post and then at the top menu bar when you see the replypost.php change that to editpost.php and hit enter. Then it takes you to either an edit or delete the post page.
The force is weak with me.
Actually, I am incorrect with the name of "Menu bar" and it should be "Address Bar" up at the top. Will look something like ...
http:///theoildrop.server101.com/forums/editpost.php?Cat=0&Board]
the actual address will look something like this, but THIS only appied to me (My post) and on this thread, so it's not something to copy and paste somewhere else to keep, just an illustration. In other words. DON'T keep clicking this link above as it won't work for any thing but my first and immediate post / reply / edit to my own post.
http:///theoildrop.server101.com/forums/editpost.php?Cat=0&Board]
the actual address will look something like this, but THIS only appied to me (My post) and on this thread, so it's not something to copy and paste somewhere else to keep, just an illustration. In other words. DON'T keep clicking this link above as it won't work for any thing but my first and immediate post / reply / edit to my own post.
Last edited:
- Joined
- Jun 2, 2003
- Messages
- 23,591
And just when I had almost given up on ever seeing another pscholte post again... Good to see the Elfenmeister back in action!
>Good to see the Elfenmeister back in action!
ditto.
ditto.
Tom did you see evidence of VIi's in the gold GC.
The reason I ask is I am planing to install an amsoil bypass filter with the new Donaldson filter EaBP-90 type on my 03 TDI. On the tdi club there have been questions regarding the bypass filter filtering out VI improvers as the bypass filters down to the 2 micron range.
I have been using GC 0w30 and was thinking of continuing.
I just don't want to use an oil where the add pac was being filtered away,and or loosing viscosity.
If your still checking this thread I'd appreciate your input.
The reason I ask is I am planing to install an amsoil bypass filter with the new Donaldson filter EaBP-90 type on my 03 TDI. On the tdi club there have been questions regarding the bypass filter filtering out VI improvers as the bypass filters down to the 2 micron range.
I have been using GC 0w30 and was thinking of continuing.
I just don't want to use an oil where the add pac was being filtered away,and or loosing viscosity.
If your still checking this thread I'd appreciate your input.
Quote:
Sorry for the confusion, I should have explained G.C.
Gas Chromatography is a technique for analyzing organic liquids to determine the ingredients. I’ll start with a plain-word analogy.
Imagine a mixture of different size balls, and you would like to know how many balls there are of each different size. You need to first separate the balls according to size, and then count the number of each size. One way to separate the balls is to roll them through a long tube, which is coated inside with a sticky coating. Each ball sinks into the sticky coating to a different depth depending on its size and shape, so each ball moves along at a different speed. As they move through the tube, the mixture of balls are separated because they move at different speeds, and by the time they make it to the end of the long tube they are separated into groups of balls. The smaller faster moving balls are all grouped together and reach the end of the long tube first. They are followed by a group of the next larger balls, and so on. In short, what the long tube did is slow down the balls according to their size and separate them into size groups, each of which then exits the tube as a group of equal sized balls.
This same principle can be applied to molecules. A motor oil is a mixture of different size and shape molecules, and to see and measure each type you first need to separate them. That’s what a G.C. does. Using a syringe, you inject about 1/1000th of a drop of the oil (a mixture of liquids) into the machine where it hits a very hot tube and boils into a mixture of gases. These gases are swept by an inert gas (helium) into a long thin tube that is coated with special chemicals. As the mixture of gases moves through the long tube, each gas dissolves into the coating and is then pulled out of solution by the helium, that is, they kind of roll through the tube like balls with the speed determined by their solubility in the coating. This separates the gases into groups, each group being a different set of molecules. As each group of molecules exit the tube they are measured and a “peak” is drawn on a graph.
By examining the graph, one can see a series of peaks, each representing a different molecule, and the size of the peak indicates how much is present. The mineral oil graph shows hundreds of peaks, all piled into a pyramid shape because they are a distillation cut containing similar size molecules. PAO looks totally different, showing discreet groups of peaks separated by a flat baseline between them. Esters can have many different looking graphs because there are many different esters. The point is, each base oil has its own unique set of peaks, and the graph serves as a thumbprint that identifies the product and its amount.
What’s it all mean? One could argue that the composition of a motor oil is not very important at all so long as it performs the way you want it to in your car. But on this forum it rises to a supreme level, an “elixir of life”!
I’m just reporting what I find, and I didn’t find esters in the Gold GC. This doesn’t mean it’s not G*d’s gift to car enthusiasts, only that it may achieve this status without esters.
Tom
Very clever explaination of Chromatography. Now, how about FTIR Spectroscopy? What is that? How does it work? What is Fourier Transform? Us peasants would like to know (at least this one would). Would SEC or GPC help to identify MWs and the particular polymers used in oils?
Knowing a little about Infrared and atomic properties, I can tell you this. different materials and gases have different absobance levels of light spectrum, corresponding to the energy required to excite electrons between different energy levels in their "shell". The wavelengths that these absobance levels occur at are called absoption bands. One description is here http://www.mee-inc.com/ftir.html.
Fourier Transform is a mathmatical method of taking a signal in the time domain and transforming it into the frequency domain.
This is used simplistically because the detector recording the reflected light is detecting in the time domain, then the FT is applied to convert the signal back into the frequency domain to read the absoption bands.
Maybe somene else will have a better explanation that is easily understood.
Here is another description: http://www.nuance.northwestern.edu/KeckII/ftir1.asp
Fourier Transform is a mathmatical method of taking a signal in the time domain and transforming it into the frequency domain.
This is used simplistically because the detector recording the reflected light is detecting in the time domain, then the FT is applied to convert the signal back into the frequency domain to read the absoption bands.
Maybe somene else will have a better explanation that is easily understood.
Here is another description: http://www.nuance.northwestern.edu/KeckII/ftir1.asp
if green and gold are the same base composition, I wonder what causes the candy-like smell in the green?? the difference in smell is unmistakable.
My guess...something in the additives gives the green GC it's sweet candy-like smell.
Mint!
Back from the dead!!!
WOO HOO. What goes on with Tom these days?
Green GC has more melted gummi bears in the formula, also explains the green color.
Per Terry, he is no longer employed by the company he was when he wrote these posts. I don't know why, but it wouldn't be much of a presumption to state that the thread(s) on Mobil was the beginning of the end.
- Status
Similar threads
- Locked
- Locked
- Locked