Mobil 1 Truck SUV versus German Castrol
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There was a university study done comparing 5W-40 Synthetic against min. 15W-40. It stated the 5W-40(CH-4 formula) was 26% TPE ester/balance PAO. Delvac 1 was the only 5w-40 at the time. This is the only public source of its' chemistry that I know of.
It did however receive a formulation change as of CI-4 rating, and its' cold cranking/MRV performance declined suggesting IMO the removal of some/all esters. But regardless of formulation we can have comfort in the fact it has "proven" itself thru millions of miles of usage.
We don't know much about GC. Castrol makes Mobil look like "chatty cathy" when it comes to chemistry and specs; even the German info on SLX, oh I mean discontinued SLX, is practically nonexistent. It's such an unknown. But many will say we have good UOAs; well I'm not convinced UOAs are the end all for seeing actual engine wear or condition. Race teams could just use UOAs, no more tear downs.
But I am glad many people have found "success" with GC.
It did however receive a formulation change as of CI-4 rating, and its' cold cranking/MRV performance declined suggesting IMO the removal of some/all esters. But regardless of formulation we can have comfort in the fact it has "proven" itself thru millions of miles of usage.
We don't know much about GC. Castrol makes Mobil look like "chatty cathy" when it comes to chemistry and specs; even the German info on SLX, oh I mean discontinued SLX, is practically nonexistent. It's such an unknown. But many will say we have good UOAs; well I'm not convinced UOAs are the end all for seeing actual engine wear or condition. Race teams could just use UOAs, no more tear downs.
But I am glad many people have found "success" with GC.
Today I found GC 0w-30 at Autozone for $4.99qt.
The same price for M1 5w-40 Suv.
Would either of these run well in my wifes new 04 Isuzu Axoim with 250hp direct injection 3.5L V6.?
My normal routine for the last 12 years, is changeing the oil, once before winter and once before summer.
During those times, changeing the filter every 3k miles and adding to fill.
The same price for M1 5w-40 Suv.
Would either of these run well in my wifes new 04 Isuzu Axoim with 250hp direct injection 3.5L V6.?
My normal routine for the last 12 years, is changeing the oil, once before winter and once before summer.
During those times, changeing the filter every 3k miles and adding to fill.
G-ManII their is an SAE papaer on the subject I belive and their is also a Univesity paper on the subject matter. They do not identify the oil by name. THey list it's spec.'s and formulation and cited that it was commonly available in North America. At the time of the paper the only widely available full synthetic 5W40 Comercial diesel with the right API rateings was Mobil's Delvac 1. The study was short term and conducted in warm weather. It showed that a synthetic 5W40 diesel oil made of 26%(XXX esters) and 74% PAO base stock was not any more effective then conventional 15W40 in preventing wear.
The study was a horrable study because it did not take advantage of Delvac-1's extended drain ability , was conducted in warm weather so cold start advantage was not demonstrated and did not take into account fuel saveing or additive packages.
The study is floating out on the internet. I read it about 3 years ago while researching bypass filters and synthetic HDEO for commericial use.
We can also tell from it's shear stability that it is not a group III.
The study was a horrable study because it did not take advantage of Delvac-1's extended drain ability , was conducted in warm weather so cold start advantage was not demonstrated and did not take into account fuel saveing or additive packages.
The study is floating out on the internet. I read it about 3 years ago while researching bypass filters and synthetic HDEO for commericial use.
We can also tell from it's shear stability that it is not a group III.
Just curious, what makes you think it's discontinued?
It is, according to the German Castrol site (although I did read it via Bablefish). It's been replaced with Formula R / RS 0w40.
Got a link?
It's actually the R/RS 0w-40 that's getting discontinued, AFAIK.
And the SLX was never a retail product, but a shop product, used by dealerships and large repair shops. That is partly why there isn't all that much info about it on European sites.
Out here (and in other Central European and Eastern European countries), they're starting to replace SLX with SLX LongTec because apparently LongTec will deal with the poor gas quality here better. But in Western Europe, SLX will continue to be sold as is.
It's actually the R/RS 0w-40 that's getting discontinued, AFAIK.
And the SLX was never a retail product, but a shop product, used by dealerships and large repair shops. That is partly why there isn't all that much info about it on European sites.
Out here (and in other Central European and Eastern European countries), they're starting to replace SLX with SLX LongTec because apparently LongTec will deal with the poor gas quality here better. But in Western Europe, SLX will continue to be sold as is.
http://tools.search.yahoo.com/langu...produkte/a_auto/a_motorenoele/a_synthese.html
These are the only 2 Castrol oils that appear in the "fully synthesis" engine oils menu.
SLX has long gone from Australian shelves, but for some strange reason the PDF document is still in the Aussie Castrol site if you do a search for it :
http://www.castrol.com.au/products/pdf/Formula SLX.pdf
TXT Softec is also in the search page of the Aussie site, although it's still available in BMW and Jaguar dealer's spare parts shelves.
http://www.castrol.de/produkte/a_auto/a_motorenoele/e_werkstatt.html
As I mentioned, it's a "Werkstatt-Produkte".
As I mentioned, it's a "Werkstatt-Produkte".
Sounds familiar :quote:
Originally posted by Quattro Pete:
it's a "Werkstatt-Produkte".
It does not matter if it is "Werkstatt-Produkte" or not. This does not change the fact that Castrol can nopt be counted upon to be honest with it's customers. It does not change the fact that Castrol will make any change it can to increase profitts even if it hurts their product line.
Castrol's own staff claims that their is no difference between 0W30 produced in the USA and 0W30 sourced from Germany. That alone tells us that they are either incompetent or liars!
Castrol's own staff claims that their is no difference between 0W30 produced in the USA and 0W30 sourced from Germany. That alone tells us that they are either incompetent or liars!
xCO(hard to read) TOPUP certs. appear similar to the old SLX. SLX longlife 2 now has no SLX name recognition either, it's called "Longlife 2 TOPUP". One can still access "old" products thru their site thus the SLX info. Here's their current line and certs..
German Castrol site
[ May 12, 2004, 10:26 PM: Message edited by: 69 Riv GS ]
a small update:
I am not sure if it's because of the milage on the oil, which is about 8500 miles right now, but my fuel milage has been a bit low lately. 1998 A6 2.8 30v fwd.
I've been getting about 16-18mpg mixed city/highway. My audi mechanic says the MAF could have lots to do with mpg (and the MAF is reading a bit high), but the oil does have about 8500 miles on it too.
I am tempted to wait out the extra miles till 10,000, but, also, I wonder if the oil is really affecting the mileage that much? Has anyone else noticed this towards the end of their german castrol OCI? Consumption has been little, but I've probably added close to a little over 3/4 quart of makeup over this 8500 miles do far, which is quite acceptable from what I understand.
.1q/1000 miles is awesome consumptin in your heavy car.
ChrisW:
Was that $2 a bottle at the Manteca Walmart? I didn't see 0w... anything there. What was there was all $4.18. Any tips? TIA.
Was that $2 a bottle at the Manteca Walmart? I didn't see 0w... anything there. What was there was all $4.18. Any tips? TIA.
Oh my God!! Someone whose brain is wired like mine?
Yes, it was on clearence for $2 a bottle at the Manteca walmart. The manteca walmart has since discontinued carrying the 0w40 and 0w20 Mobil 1 and now only carries 5w30, 10w30, 15w50 and 5w40. They also got rid of chevron supreme and a grade of supertech syn that I think was 5w30.
The stockton walmart, off of Hammer Lane near 99 (by home depot) carries the 0w20, 0w40, 5w30, 10w30, 15w50 for $3.38 a quart last time I checked. The 5w40 is still $4.81 a bottle over there, but, if they ever bring the SUV oil down the $3.38, then I'm sold, that is dirt cheap for that oil!
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