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What are your thoughts on M1 0w-40? The oil has shown to shear down to a high 30wt oil many times. While it would thicken back up over time do to oxidation, some don't like it bc it does shear. Wear metals are so so and usually your 5w-40's show better results.

IMO, this oil tries to be a one size fits all and with that makes some compromises. It's now SM rated. Your 5w-40's are usually loaded with more ZDDP also. Someone mentioned cleaning ability and that is why it shows higher wear metals. I don't buy that being other ester based oils like D1/M1 SUV show better results. Thoughts?

Oh and the argument that it comes factory fill in high end cars is a good point, but most of those cars hold 9 qts of oil so I'm not really impressed by that fact.
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Big Grin

I did not read your supplied link but think it's funny that a few of that oils critics cannot even tell exactly where the nickel comes from based on remarks made in the past denouncing it's ability to protect valve train .

I think it's a well built engine oil and with that comes the meeting of many certifications . I also beleive many use it out of application and simply don't need the VI .

Thinning . If the oil starts at 13.8 for example , thins to 12.5 @ 7500 miles then thickens back up to starting point at 15k it has remained in grade throughout the interval , correct ? It has also given better fuel economy over that period than for example an 11.5 cSt synthetic oil that thickens to a upper 40wt or lower 50wt ,correct ?

During that period the Mobil oil still pumped better than the example oil because it did not suffer oxidative thickening and harming the performance of the oil at or below the 40c mark during cold weather and the warm up phase which is something the ACEA has become increasingly aware of .

Thinning and use of polymers : I believe you said on this forum that you used the green Castrol and the engine was sluggish . Most that have a keen feel for their engines can tell the difference when that oil is used in a motor of smaller displacement . No polymers in that one , correct ? Oil makers use polymers to their advantage . Sometimes oils without polymers can be felt by the owner during the warm-up phase dependant ot not on lifter design . You might have been one of them Smile

In my view only people thinking of perfect worlds believe that synthetic oils for daily drivers that see's all types of operation should be made without VII's .

Maxima makes a ultra premium 10w-40 bike oil that is only 12.5 cSt @ 100c . They use some of the best VII's available in the formula for better overall performance . I think Maxima builds an oil based on their concept of what makes a good oil . I believe the same when it comes to Mobil and their 0w-40 .

Wear protection , the 0w-40 has it and the better engines show it through analysis .
Buster, you just HAD to bring this topic over here, didn't you?!?

Motorbike, it is SO nice to FINALLY see someone else that knows about Maxima's oil formulations and quality. After all of my other posts on the other oils that I asked about, I went with their Maxum 4 Ultra 0w30 for my Honda. The additive package is even beefier than the Extra addtive package that you posted earlier, and since it doesn't consume oil at all, no risk with the cat poisoning issue that seems to panic everyone over "there"!!

I also started running their Super M 2-cycle lube in my fuel, for the PIB component benefits. The doseage seems to be ounce/gallon of the lube, which is what I have in the tank right now. So far, so good.

I also am considering their other lines for all of my vehicles, due to the construction of them. Built like tanks, pricey, but when it comes to "my babies", they are most DEFINITELY worth every penny!!! Big Grin
The Maxima 0w-30 has swept the west coast road race tracks and is used by many of the Porsche guys with a high degree of success . I kinda get the idea that the Attack Kawasaki AMA Team uses their oil also .

Want a battle tough dino ? They make a 5w-30 .

Back to Mobil 0w-40 . The HT/HS is actually 3.9 . 3.6 is the minimum HT/HS .

Check out the Mobil UK site and you'll see that one of the worlds best gasoline engine oils is also one of the best diesel engine oils . See all the ratings and manufacturers approvals it meets .

Not a chance those polymers will become precursors of sludge formation with that formula and appropriate drain intervals .

There's more to be said about oil consumption in certain engines when using this oil but I'm keeping those few tidbits to myself Razz
Motorbike, your well missed on bitog. I always enjoyed your posts. Smile

I had the GC in my Honda and it made it sluggish. I currently have M1 0w-20 in my car. I've used about 1/4qt in 5,000 miles so far. Might be 1/2qt actually.

On one hand the 0w-40 does have impressive approvals. That in itself says a lot about the oil. Do you think this oil in the summer months would make my car sluggish as compared to the GC? The Mobil UK and Castrol UK sites recommend this oil for the engine in my car. I'd like to try it just for kicks. *BTW, checkout the UOA of M1 0w-20 with 20k miles on it. Thickend only to a 30wt. If that were Amsoil it would have been a 50wt!
MG, probably not esters but AN/PAO.

Motorbike, someone pointed this out on BITOG

It's the only oil EM states that it cleans/deposits and sludge.

Our lineup of Mobil 1 motor oils includes a 0W-40 viscosity, which is the viscosity recommended by many European car builders. Mobil 1 0W-40's wide viscosity range provides unsurpassed levels of protection and an overall smooth driving experience. Mobil 1 0W-40 keeps engines starting in Arctic-extreme cold, and it cleans deposits, sludge and varnish often formed in high temperature operating conditions.

Posted UOAs in the infamous engine can show 7fe or as posted a 17fe compared to av of 12fe - ? what is conclusion

An engine is recommende a 40 in europe but 20 US if a 0W40 shears is this an issue?

If high heat from ambient or use should visc be reduced or increased.

With cold starts and short trips do you want thinner oils and perhaps esters?

Doug posted "there are no magic oils" but expressed a view based on vast experience.

In the UK Castrol and M1 are described as "shed oils" but cost is a driving factor!

What is obvious is when push comes to shove a number of experts are silent, perhaps censorship rules!
Originally posted by Buster:
MG I have no idea. What are ad hoc UOA's? Smile

Most on BITOG have dismissed the cleaning ability as pure marketing by EM.

And their credentials in the Industry are ??????? Razz

Mobil has also performed in house " dyno mule " and field test using their older high-mileage formula and the results showed cleaning abilities .

Hmmm. They can do that with a mineral/pao blend but they cannot when it comes to this GM-LL-A-025 GM-LL-B-025 synthetic oil ?

The Mobil 0w-40 data sheet goes a bit further than what you posted . They describe it as having an active cleaner . I believe them .
During that period the Mobil oil still pumped better than the example oil because it did not suffer oxidative thickening and harming the performance of the oil at or below the 40c mark during cold weather and the warm up phase which is something the ACEA has become increasingly aware of .

This oil also contains a good amount of grp V base stock. It's also designed to shear down and handle soot over long drains. It will definitely keep your engine clean. Smile
Originally posted by Buster:
One could then make the argument that RL shows more wear because it's cleaning. That I wouldn't doubt.

Or one might could argue that with all that moly they use and type of it , the formlated oil with base stock used " might " not pass one or more of the following tests and whats being seen is a bit of corrosion. And it also might well be that with the different metalurgy used in all these engines some just show different than others .

Recall my bringing attention to the sputter coated bearings used in the VW's and other Bavarian engines .

Cu Corrosion, 3 hrs @ 163C

Zn Corrosion, 3 hrs @ 163C

Pb Corrosion, 3 hrs @ 163C

Al Corrosion, 3 hrs @ 163C

50/50 Pb/Sn Corrosion, 3 hrs @ 163C
Originally posted by MGBV8:

What is obvious is when push comes to shove a number of experts are silent, perhaps censorship rules!

More like frustration. It's tough to argue with statements relevant to "I know you are but what am I?"

I see a lot of the people who made logical and rational comments gone from BITOG or at least lurking without posting.

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