I've driven roughly 2000kms (1250 mi) since my last oil change with GC. What went in nice and green has turned medium brown already. Is it cleaning my previously dino-only engine or just normal color change?
GC Darkening Quickly
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It actually is a negative ionic transfer, the process of which causes the green color to transfer to the wallets of the manufacturer, and the brown waste from the same company to be deposited inside your engine.....
Sorry...
Although I am no engineer, it seems to me that the color change is caused by the oil doing what it is supposed to.
Best of luck.
Bob W.
quote:
Originally posted by TheFuror:
It actually is a negative ionic transfer, the process of which causes the green color to transfer to the wallets of the manufacturer, and the brown waste from the same company to be deposited inside your engine..... :cheers:Best answer I have seen in a LONG time!
Sorry...
Although I am no engineer, it seems to me that the color change is caused by the oil doing what it is supposed to.
Best of luck.
Bob W.
Mine did not darken much. Probaly your engine is dirty. Check EGR valve.
I have put GC in three known-to-be-spotless engines. Even when very fresh, the green sheen is hard to see in the small quantities of oil you pull out on the dipstick, although you can generally see it on a white paper towel used to wipe the stick. In each instance, it has darkened to a medium amber fairly quickly, but even after 5,000 miles, it still looks good. Unless it got really black really fast, I wouldn't worry about it too much.
What was the expiration date on the bottle?
I may be wrong but that green colour in GC sure looks a lot like fluorescene,an organic dye.May be for marketing (every body here sure it including me) or possibly for leak detection.Perhaps if someone has a "black light" still kicking around from Holloween they might try and irradiate a few mls of virgin oil to see if it glows. Just a thought.
Interesting point you brought up, islip. Flourescein is also used as a dye in antifreeze/coolants. It's used diagnostically for ophthalmic conditions, too, and other prodedures I'm sure I've missed. It would be interesting to pour a small sample of GC into a glass (some plastics absorb UV) vial and expose it to any UV source - even a common fluorescent light should make it fluoresce (green-yellowish) visibly at close range if there's fluorescein in it.
(and then, again, maybe it's just green mold in GC...)
(and then, again, maybe it's just green mold in GC...)
I am a newbee. What does GC sand for?
First of all,
GC is this site's abbreviated term for German Castrol. It is 0W-30 rated, meets ACEA A3, MB, BMW LL, and VW standards, and has produced some excellent UOAs (used oil analysis). It is most likely the same oil as is available in Europe called Castrol SLX. This oil seems to be available mostly (only?) at Auto Zone stores but should not be confused with the US made 0W-30. Easy way to tell is the German version says, interestly enough, "Made In Germany" on the back of the bottle. On the front, 0W-30 is in a red box. US version says "Made in USA" (duh) and the 0W-30 is in a yellow box. GC (SLX) also has a nice green hue and seems to have a sweet aroma to it like a Gummi Bear smell. Look around, there is a ton of info on this wonderful elixer
Thanks shortyb, so this is the prefered oil over Mobil 1, like the sticker under the hood says on my car?
Sorry for the
The only true way to tell which oil, be it GC, Mobil 1 etc., works well in your particular car is to do an analysis. Regardless of what the "recommended" oil from the manufacturer may be.
The Blackstone/Dyson package is very comprehensive and the education/support you get from Terry Dyson is superb. Search around in this, the Used Oil Analysis, and Virgin Oil Analysis forums to gain some familiarity of different oil's characteristics. Also the General topics listed at the top left of the header page have lots of good info too.
GC flouresces very well under 'black light', but I'm pretty sure it doesn't contain Florescein - I use hydrocracked intermediate oils at work, and many glow green just like GC.
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What kind of car did you put it in and how many miles?? What viscosity was in use previously?
Vehicle is a 1999 Elantra 2.0L. Put GC in at 42000kms (26250mi). Vehicle had dino oil changes every 3000kms up until this point. So, my guess is that the engine was pretty clean even before the GC.
I plan to run the GC as per Hyundai's recommended 6000km OCI.
I have put GC into:
1) Toyota Camry with 1MZ-FE V-6, great UOA (do a search for "Camry" and "German Castrol" in the UOA section, and you'll see what I mean).
2) Toyota Sequoia with 2UZ-FE V-8, no UOA yet, but runs very smoothly.
3) Infiniti G35 Sedan with VQ35 V-6. Just 1k miles into first run of GC. I'll be doing a UOA on this fill in about a month. So far, subjectively, GC runs very nicely in this engine.
1) Toyota Camry with 1MZ-FE V-6, great UOA (do a search for "Camry" and "German Castrol" in the UOA section, and you'll see what I mean).
2) Toyota Sequoia with 2UZ-FE V-8, no UOA yet, but runs very smoothly.
3) Infiniti G35 Sedan with VQ35 V-6. Just 1k miles into first run of GC. I'll be doing a UOA on this fill in about a month. So far, subjectively, GC runs very nicely in this engine.
What's Mobil 1?
Some old school oil that way way overhyped.quote:
Originally posted by Audi Junkie:
What's Mobil 1?
600 miles on my green goodness and it is still green(ish). 2004 Elantra, but I only have 6600 miles total.
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