BEZ06

As I mentioned in post# 14, the Mobil people briefing us at the Rolex 24 said "in dealers Feb 1st, not available in retail stores for 6 months".

So...you won't see it anywhere but a dealership until probably September or so.

.

JoesC5

I was pointing out to the person I quoted that 0w40 Mobil1 oil is not any more expensive than 5w30 Mobil1 at Walmart, as that was his excuse as to why he won't be using 0w40 oil, as he can't afford the 0w40.

mmorse

not sure about later year c7s but the manual on my ‘14 states to use a synthetic 5-30 dexos1 certified oil. pennzoil platinum qualifies and it tests as well and even exceeds some amsoil tests over mobil one. used it without incident for many years in my c6 and use it now in my dry sump c7. manual also states the change interval is 7500 miles which i adhere to. a friend gave me 4qts of mobil one 0-40 a couple years ago but i never used it. i live in southern CA so the car is not subjected to cold weather and summer weather is in the eighties or less most of the time.

MitchAlsup

Cold starting data from Mobil One::

10W-30: Viscosity, @ 40ºC, cSt (ASTM D445) 63.2
HTHS viscosity, mPa•s @ 150ºC (ASTM D4683) 3.0
Pour Point, ºC (ASTM D97) -42

5W-30: Viscosity, @ 40ºC, cSt (ASTM D445) 61.7
HTHS Viscosity, mPa•s @ 150ºC (ASTM D4683) 3.1
Pour Point, ºC (ASTM D97) -42

0W-40: Viscosity, cSt (ASTM D445) @ 40ºC 70.8
HTHS Viscosity, mPa•s @ 150ºC (ASTM D4683) 3.6

So, unless you want to argue that 70.8 is smaller than 61-63 you will need to admit that 0W-40 oil is thicker at startup than 10W-30.

LDB

I do not know the legal rules for labeling full synthetic in Europe, but I can deduce that they are probably similar to ours. Basis for my deduction is going to the Exxon website, choosing England as the country, looking at the MSDS sheets of several English Mobil1 oils listed as full synthetic, and seeing that like the US, they contain substantial quantities of group 3 synthetics, ie, the stuff that the purists try to call fake synthetic.

LDB

40C equals 104F, so that is considerably warmer than most startups. You would expect the crossover point of equal viscosity for 0W40 and 5W30 to be about that temp. Below that temp, 0W40 would be thinner, and above it thicker. Yes, yes, I know, your data say 63 versus 71, not the equal crossover point. But there is some spread in allowable viscosity for the two ranges. And at that temp and viscosity, only about 5 degrees C will change the vis by about 8 cSt. The point is that at a true startup temp of 70F or so, and especially at a winter startup temp of 20-40F, you can be sure the 0W40 will be thinner.

franknbeans

you can buy the Europe version on Amazon already.

Foosh

Yes, that was true when your manual was written more than 4 years ago. However, new knowledge is gained over time, and improved products are developed. Thus, the recommendation has now changed in January 2018, a new Mobil 1 0w40 Dexos-certified oil been developed, and it is now the recommended oil for all C7s.

All 19's are now filled with the new 0w40 at the factory. The LT1 in 2019s is the same engine as in your 2014.

MitchAlsup

It is too bad that Mobil does not allow us to see the -40ºC (or -40ºF) data on viscosity.

Jmhornz71

This is the info I read for part numbers for the new Mobil 1 caps
Base car Part# 12686472 Price Approx $6.45
Z51,Z06,GS,ZR1 Part# 12680708 Price approx $23.12

No clue why one is more than the other

bigsapper

Dry sump vs wet sump?

Jmhornz71

Yes sir that must be it

Gearhead Jim

Mobil isn't making this easy, can you tell if the numbers you quoted are for the new Corvette 0W-40 or for the older blend?

JoesC5

I did find this info on a different forum. https://genesisowners.com/hyundai-ge...ne-using/page3

"Based on the MSDS docs for Japan (where they are required to disclose the amount of mineral oil, which technically includes Group III), it appears that most Mobil 1 oils contain about 35-50% Group IV-V components (since they contain about 50-65% mineral oil). It does vary by the type and viscosity of the oil, even though they are all Mobil 1. You can find the MSDS docs on the Exxon Mobil website. I have not looked at them in a couple of years, so they may have changed, especially since there continue to be quality improvements in Group III synthetics (severely hydrocracked mineral oil).

They did not have a Japanese MSDS for Mobil 1 EP oils (last time I looked), but I have read on the Mobil 1 website where they pretty much say that EP contains more polymers/esters than regular Mobil 1 (but don't have a link for that).

However, regular Mobil1 0W-40 European Formula contains the most Group IV/V components of all the Mobil 1 oils from what I could determine, since they don't allow Group III to be sold as synthetic in much of Europe............"

Foosh

Although, it's probably only available at a few dealers now, the new stuff will have a Dexos logo on the bottle.

I find it amusing that the new '18, which I picked up yesterday, and which was built the last week of '18 production has 5w/30, but it does have the new Mobil 1 cap.

Three days later, they started building 19s and filling them w/ 0w40. I'll changeover at my 500 mile oil change, which will be in a couple of weeks with 110 miles on it the first day.

mschuyler

He said he has a C6.

Patman

rrsperry

Actually it’s a higher number which means more flow, hence the 0 number...it flows better cold, and is thicker when hot.

LDB

The article you referenced says that since 50-65% is stated as what amounts to group 3, the remaining 35-50% must be group 4&5 even though it doesn’t say what the remaining material is. I can’t rule out the possibility that the missing stuff is group 4&5, but I certainly wouldn’t feel safe in assuming it is. On materials like base oils that aren’t very toxic, there’s too much leeway given for trade secrets, and too much variation in rules from country to country and even from time to time within the same country to deduce info about unstated aspects of the composition. So to be sure, you need to find an MSDS that specifies group 4 directly, with buzz words like 1-DECENE, HOMOPOLYMER HYDROGENATED. The highest Mobil1 I’ve seen on that kind of direct evidence is racing 0W-50, which lists 60-70%. Most either don’t list it (which may or may not mean those are zero group 4), or have fairly low levels like 15-35%. It will be interesting to see whether the new oil’s sheet lists it, and if so, how much. While a few have claimed to have seen the new oil’s sheet, none of them have been fully consistent, meaning exactly the same name and/or product code clearly specified and clearly linked to the Dexos spec. So far it’s stuff like Tadge used the ESP name, here’s an ESP oil with recent date, except when you look at it, the oil’s titles are slightly different and no product codes are given, so you simply don’t know with confidence.

GOC

What does the "ESP" stand for?