M1

[kcryan]

So i know that the regular 5w-30 M1. is real thin. im pretty sure the 10w-30 is. how bout the EP? and how bout the 40 weights. are they thinner? could/should i use them in a car that usually gets 30 weights?

thanks

 

[y_p_w]

quote:

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Originally posted by kcryan:
So i know that the regular 5w-30 M1. is real thin. im pretty sure the 10w-30 is. how bout the EP? and how bout the 40 weights. are they thinner? could/should i use them in a car that usually gets 30 weights?

thanks

---

Actually Mobil has reformulated them for GF-4. Now the PDS "typical viscosity" at 100ºC are the following:

M1 5W-30: 11.3
M1 10W-30: 10.0
M1 EP 5W-30: 10.25
M1 EP 10W-30: 10.5

My car's engine is known to be tolerant of a wide range of oil weights, so I have no problem using the newer M1 5W-30. The "regular" M1 5W-30 probably has a crossover point (compared to the 10W-30) where it's thicker somehwhere around maybe 70ºF. I don't know if the stuff I used was already reformulated or the older formula. Probably doesn't matter except for the most anal.

 

[bighead]

From what I've heard...and don't quote me cuz I could be wrong...the 10w-30 is not as thin and is more shear resistant. Less VII in the 10w-30. I don't know much about the 40 weights, but I've wondered the same thing. Now, as far as the EP goes, I'm pretty sure they are more robust and thicker, because I noticed they aren't "energy conserving" like the regular M1. Hope this helps...and again if I'm off base here somebody help us both out...

 

[bighead]

...well, nevermind. I didn't know they reformulated for the GF-4. The 5w-30 I just dumped seemed pretty thin, so maybe I got my hands on some old GF-3 stock from wally world...

 

[Mitch Alsup]

quote:

---

Actually Mobil has reformulated them for GF-4. Now the PDS "typical viscosity" at 100ºC are the following:

M1 5W-30: 11.3
M1 10W-30: 10.0
M1 EP 5W-30: 10.25
M1 EP 10W-30: 10.5

---

Is the control of viscocity at the factory sufficiently precise that 5W30 and 10W30 are actually different processes,

Or

is it likely that the oil is produced in large batches and most of the product can be bottled up as either 5W30 or 10W30 with only a few batches that have to be bottled as one or the other?

 

[kcryan]

huh the 5w-30 is the thickest......interesting

 

[Amkeer]

The Mobil 1 5w30 is actually closer to 11.7 cst, but whose counting.

 

[y_p_w]

quote:

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Originally posted by Amkeer:
The Mobil 1 5w30 is actually closer to 11.7 cst, but whose counting.

---

It might due to regular manufacturing variations, but the spec sheet says typical viscosity is 11.3 cSt at 100ºC.

http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_5W-30.asp

 

[Doug Hillary]

Hi,
this from y p w;

"Actually Mobil has reformulated them for GF-4. Now the PDS "typical viscosity" at 100ºC are the following:

M1 5W-30: 11.3
M1 10W-30: 10.0
M1 EP 5W-30: 10.25
M1 EP 10W-30: 10.5"

is a good indication of why some Euro Manufacturers are so particular about using Approved oils and Listing them as such

Amongst other specific test protocols (ACEA & own)Porsche for instance requires the following;

a) a minimum of 11 mm2/s kinematic viscosity (SAE 30) at 100C;
b) HTHS viscosity (CEC-L-36A-90) over 3.5cSt (Bosch test protocol)
c) a max of 12 % evaporation loss (the NOACK test at 250C)
d) Porsche specific test: volume of air bubbles in the oil (foaming control)
e) 120 hours engine test of oil stability in case of 0W-40 and any XW-30 grades
(The oil must stay within the ACEA's A3/B3 grade tolerances during this test - which in reality is probably a user equivalent or 20k+ kms)

This is why they fill all engines with M1 0w-40

I think the only 5w-30 oil Approved/Listed by Porsche is/was GC 5w-30

Regards
Doug

 

[kcryan]

huh? GC 5w-30???

 

[John_E]

Mobil 1 0W-40 "[spoiled] European car formula" is evidently unchanged, with its 100C viscosity still listed as 14.3cSt.

I do have some anecdotal evidence of shearing, in that my oil consumption is 0 for about the first 1000 miles after an oil change and maybe 1/4 qt. during the third (and last, for me) 1000 miles after a change.

 

[buster]

Thanks for the info Doug.

quote:

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The 5w-30 I just dumped seemed pretty thin

---

I'd like to know how you all can determine what is thin or not or the differences between a 10.5cSt oil vs a 11.5 cSt oil?

One advantage of having a low end viscosity is that you have some room for oxidation, which in a really good oil, won't happen much. So if your using Mobil 1 over a long drain, you'll have more room to stay within the original viscosity. Mobil 1 0w-40 over a 20,000 mile drain probably be in a 40wt range, which is a good thing. Their are reasons why some oils are formulated the way they are. For instance, Mobil 1 0w-30 Racing oil's HT/HS of 2.99. 76 NASCAR racing oil was the same. They are made to shear bit then thicken. You don't want to cut into HP gains with an oil that becomes a 50wt.

 

[Losiho]

quote:

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Originally posted by kcryan:
huh? GC 5w-30???

---

AFAIK, Castrol SLX/GC 0w30 and TXT Softec/Formula R 5w30 are/were the only 30w Porsche approved oils.

 

[Doug Hillary]

Hi,
currently I believe that Castrol's ONLY "street usable" Porsche Approved oil worldwide is their "R" or "RS" 0w-40. It has a good reputation here too

This oil is deemed to be "Fully Synthetic" in Europe

I know that the original 1996 Formula SLX 0w-30 oil was Porsche Approved and this Approval was still current through formulation changes up to 2000. The Castrol oil we then knew here in OZ as "TXT Softec Plus" (5w-30 viscosity and forerunner to the current "R" 5w-30)was also Porsche Approved. It was sold alongside the last version of SLX prior to its recall
Some of this oil (TXT and SLX) is still on shelves all over the place and it is sold alongside the current "R" version

Thank goodness I stopped using the stuff over five years ago otherwise I may have had a sump full of Castrol Formula SLXTXTR 3.3w-30

Elves oh Elves please forgive me

Regards
Doug