I keep reading how Mobil 1 5W-30 is not that shear stable and that it's a black sheep in their lineup. Are these facts or just myths?
I've been running this oil in wife's RX300 with Toyota sludge monster for most of it's 50K miles changing every 5K miles and it doesn't burn a drop and oil looks fairly clean throughout entire interval.
I guess UOA is in order to really find out what is going on but I would love to hear your opinions on this oil.
Is there really a shearing issue with M1 5W-30?
- Thread starter F1Crazy
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Trysynthetic yes; Supersyn no. Check out the 15,000 mile 5w-30 mobil 1 report from 3 mad Ponchos. Rock steady viscosity the entire time with Supersyn.
Au Contrair, Mon Frer, I have 4 analysis at 6 to 7k miles in my 02 silverado 4.3 showing the Visc increased to 40 Wt at 100C.
Patman
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quote:Better to have it thicken up than thin out, IMHO. Mobil 1 is already on the thin side, so thickening up is a good thing.
Originally posted by dickwells: Au Contrair, Mon Frer, I have 4 analysis at 6 to 7k miles in my 02 silverado 4.3 showing the Visc increased to 40 Wt at 100C.
![[Smile]](images/icons/smile.gif){kind=icon}
quote:IME they are myths perhaps based on the older trisyn formula. M1 ss 5w30 is doing great in my GS430. UOA @ 6000 miles showed it in spec with low wear #s, TBN still doing fine. They said to run it to 8-9k miles and check again. That's with about 50% miles stop and go with short trips too.
Originally posted by F1Crazy: I keep reading how Mobil 1 5W-30 is not that shear stable and that it's a black sheep in their lineup. Are these facts or just myths?
This has got me thinking. Mobil 1 may be thin on paper (VOA, tech sheets) but when it comes out of an engine, the viscosity is usually perfect. It usually ends up around 10-10.5 at 100 C. Pretty much all dino 5-30s end up well below 10. ![[I dont know]](/forums/graemlins/dunno.gif)
Perhaps this whole mobil 1 is too thin argument is moot ![[Confused]](images/icons/confused.gif)
Perhaps this whole mobil 1 is too thin argument is moot
Patman
Staff member
quote:I just got another idea, and I really hope someone at Mobil reads this and considers it. Why don't they just make their 10w30 closer to 12cst at 100c? They've got the 5w30 as the lower end 30wt, so why not make the 10w30 much thicker, since a lot of 10w30 users are those with higher mileage (looser clearance) engines that need the thicker oil. Then they can keep the 5w30 as is, for the fuel economy benefits, and the newer car owners will run this. They already were labelling the 10w30 as "high mileage formula" for a while there, so why didn't they go all the way and actually turn it into a higher mileage formula? The high mileage 10w30s out there (like Maxlife, Pennzoil HM, GTX HM) are all formulated as a very thick 30wt.
Perhaps what Mobil 1 needs to do is come out with a 5w40 oil. Something that is on the very thin side of a 40wt, say 13.0cst. Something like that could probably be made so that it does not thin out of grade as easily as their 0w40 does.
I'm going to say the same thing here as I said in another thread. I'm not too sure the viscosity changes we've seen in M1 are because of "shear."
There've been some good UOA's in what we believe are high shear engines like Toyotas with gear driven cams, and some poor ones in engines I would think were low shear like large American V8's. We've also seen widely varied results in mechanically identical engines. This points to temperature differences or some other usage factor IMO...
I do not even understand why anyone would switch between the 5W30 and 10W30 M1 oils. THey are essentialy the same oil with the 10W30 putting down the best UOA for the entire SS line. THe fact that Mobil even makes a 5W30 is insane!! Their is nothing that theis only does that their 10W30 did not already accomplish! THeir 0W40 is even more insane. It has to be the worst synthetic oil they have ever put their name on. It can not hold it's viscosity to save it's life! In my opion their 10W30 and 15W50 are the best two oils they make. THeir 5W40 Delvac 1 also rocks. They should have just rebottled their 5W40 Delvac 1 as M1 SS 0W40.
quote:Did you ever stop to think that Mobil actually DESIGNED this oil to have an initial loss in viscosity and then a gradual increase over the course of the more demanding European extended drain intervals? (You really should look into registering www.ihatemobil1.com .)
Originally posted by JohnBrowning: THeir 0W40 is even more insane. It has to be the worst synthetic oil they have ever put their name on. It can not hold it's viscosity to save it's life!
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John, are you sure your not insane? Would I like to see them make a 10w-40 or 5w-40?(Other then D1) Yes.!!! Would I like to see them make a A3 rated 30wt oil? Yes. I'll say this, there isn't another oil with a 40pt!!!spread that can or will hold it's grade!!! Mobil engineers know this, its in the papers. It will thicken over the course of its life!!! Amsoil's specs on its 0w-40 aren't good either, take a look. No 0w-40 will be!!! I do wish they made a 10w-40!!!!!!!!
BTW, John, how is the 15w-50 in the Tundra? Any HP loss?
!!!= Johnbrowning. ![[LOL!]](/forums/graemlins/lol.gif)
![[Cheers!]](/forums/graemlins/cheers.gif)
[ August 19, 2003, 06:37 PM: Message edited by: buster ]
Would I like to see them make a 10w-40 or 5w-40?(Other then D1) Yes.!!! Would I like to see them make a A3 rated 30wt oil? Yes. I'll say this, there isn't another oil with a 40pt!!!spread that can or will hold it's grade!!! Mobil engineers know this, its in the papers. It will thicken over the course of its life!!! Amsoil's specs on its 0w-40 aren't good either, take a look. No 0w-40 will be!!! I do wish they made a 10w-40!!!!!!!!
BTW, John, how is the 15w-50 in the Tundra? Any HP loss?
!!!= Johnbrowning.
[ August 19, 2003, 06:37 PM: Message edited by: buster ]quote:Doesn't the 5w30 work better in winter?
Originally posted by JohnBrowning: I do not even understand why anyone would switch between the 5W30 and 10W30 M1 oils. THey are essentialy the same oil with the 10W30 putting down the best UOA for the entire SS line. THe fact that Mobil even makes a 5W30 is insane!! Their is nothing that theis only does that their 10W30 did not already accomplish!
Patman
Staff member
quote:Definitely. When it's -20F, you definitely want 5w30 in there over 10w30, without a doubt. Even at 0F there is still a big advantage with the 5w30. One could almost argue that there is no need for Mobil 1 to make the 10w30 anymore, since their 5w30 doesn't thin out. That's why I'd love to see Mobil turn their 10w30 into a true higher mileage oil and thicken it up to a heavier 30wt.
Originally posted by sbc350gearhead:quote:Doesn't the 5w30 work better in winter?
Originally posted by JohnBrowning: I do not even understand why anyone would switch between the 5W30 and 10W30 M1 oils. THey are essentialy the same oil with the 10W30 putting down the best UOA for the entire SS line. THe fact that Mobil even makes a 5W30 is insane!! Their is nothing that theis only does that their 10W30 did not already accomplish!
quote:Me too, it makes no sense to advertise an oil as "High Mileage" vehicle formula when the visc. is 10 csts. Plus it would give people like myself who don't want to order a specialty brand like Redline/Amsoil another choice for an A3 rated oil. German Castrol is one but I don't know if it's here to stay. [ August 19, 2003, 07:05 PM: Message edited by: buster ]
That's why I'd love to see Mobil turn their 10w30 into a true higher mileage oil and thicken it up to a heavier 30wt.
Mobil 1 5W30 SS:
it is now 4months old and 2600miles old. Hot oil pressure is 10psi less than the normal 60psi at 2000rpm factory spec. I suspect this oil has sheared as it seem to be running thin.
An oil analysis will tell all as i will change at 3,000 to the OW30 as a winter-fall experiment. The German 0W30 Castrol looks interesting.
If the viscosity cST is perfect I will have a the oil pump, oil pressure gauged, and pressure sensor voltage tested.
On a highly maintained 3800 GM with 70,000miles I highly doubt the old engine myth of bearing expansion is plausible at this age.
Patman
Staff member
quote:I'm one of the more vocal ones about Mobil 1's "thinness" and in all honesty, it's not too thin for most of the engines out there. It's just that for the engines in the Camaros, Firebirds and Corvettes (the LS1 and LT1 versions) this oil is thinner than those engines like. But as evidenced by many great Mobil 1 reports on here from other engines, those with tighter clearances, it shows this oil is still very good. Perhaps what Mobil 1 needs to do is come out with a 5w40 oil. Something that is on the very thin side of a 40wt, say 13.0cst. Something like that could probably be made so that it does not thin out of grade as easily as their 0w40 does.
Originally posted by Drew99GT: This has got me thinking. Mobil 1 may be thin on paper (VOA, tech sheets) but when it comes out of an engine, the viscosity is usually perfect. It usually ends up around 10-10.5 at 100 C. Pretty much all dino 5-30s end up well below 10.
quote:IME they are myths perhaps based on the older trisyn formula. M1 ss 5w30 is doing great in my GS430. UOA @ 6000 miles showed it in spec with low wear #s, TBN still doing fine. They said to run it to 8-9k miles and check again. That's with about 50% miles stop and go with short trips too. [/QUOTE] Are the cams gear driven in that engine? How big is the oil sump? 5W-30 just went in again a few days ago since I already had it and it won't get changed probably till winter. I think that with a possibility of Chicago trip during winter it will go in that car again but maybe I'll try M1 10W-30 next year during the hot months.
Originally posted by MRC01:
quote:Are the cams gear driven in that engine? How big is the oil sump? Honestly in Tn, there is no reason not to use the 10W-30. The 5W is OK but the 10W is better IMHO 5W-30 just went in again a few days ago since I already had it and it won't get changed probably till winter. I think that with a possibility of Chicago trip during winter it will go in that car again but maybe I'll try M1 10W-30 next year during the hot months. [/QUOTE]
Originally posted by F1Crazy:quote:IME they are myths perhaps based on the older trisyn formula. M1 ss 5w30 is doing great in my GS430. UOA @ 6000 miles showed it in spec with low wear #s, TBN still doing fine. They said to run it to 8-9k miles and check again. That's with about 50% miles stop and go with short trips too.
Originally posted by MRC01:
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