Whos running Mobil 1 0w-40?

dparm wrote

You have an incredibly small and very vocal minority. I wouldn't lose sleep over the bearing issue. This is nowhere near as bad as the early S54 problems.

And yes, I believe that a thinner oil will make a difference, as I explained above.

Who knows.....?

I was already planning on using it the next oil chamge in about 5000 miles.

I am on Mobil 1 0W40 for the last oil change. Car runs smooth, warms up more quickly, has lower normal operating temp. MPG is also approximately ~3.0 MPG better.

aznboi319 wrote

I am on Mobil 1 0W40 for the last oil change. Car runs smooth, warms up more quickly, has lower normal operating temp. MPG is also approximately ~3.0 MPG better.

3 mpg increase is VERY significant. Could this improvement in MPG, a cause of the decreased oil viscosity, create less or more friction thus altering (albeit possibly insignificantly) friction/wear/damage on internal motor and "maintenance" items. I am speaking in general and not rod bearing specific.

Basically, M3Post theory of thinner oil = more oil where needed to help mediate rod bearing issue aside, will the thinner oil result in less wear/tear on motor and longevity due to better efficiency (as seen in MPG), or is this greater efficiency resulting in thinner oil thus creating MORE friction among moving parts??

Sorry, I don't know much about motor engineering and I'm beating a dead horse at this point, just wondering if my wonders are answerable or irrelevant (Seems like the latter)

325rider wrote

3 mpg increase is VERY significant. Could this improvement in MPG, a cause of the decreased oil viscosity, create less or more friction thus altering (albeit possibly insignificantly) friction/wear/damage on internal motor and "maintenance" items. I am speaking in general and not rod bearing specific.

Basically, M3Post theory of thinner oil = more oil where needed to help mediate rod bearing issue aside, will the thinner oil result in less wear/tear on motor and longevity due to better efficiency (as seen in MPG), or is this greater efficiency resulting in thinner oil thus creating MORE friction among moving parts??

Sorry, I don't know much about motor engineering and I'm beating a dead horse at this point, just wondering if my wonders are answerable or irrelevant (Seems like the latter)

I saw no such MPG change when I switched

M1 0w40 is about 25%-30% thinner than TWS in operation. That does not, however, equate to 25-30% better gas mileage. I think you'll find that after running several tanks of gas it *might* be 1mpg better, perhaps less.

W/// wrote

I saw no such MPG change when I switched

dparm wrote

M1 0w40 is about 25%-30% thinner than TWS in operation. That does not, however, equate to 25-30% better gas mileage. I think you'll find that after running several tanks of gas it *might* be 1mpg better, perhaps less.

Good to know. 3 MPG increase at an assumed 16-20 mpg average is a monumental increase. Dat der placebo affect

Using it for the winter. I find the car is less throttle-sensitive in first and second when cold.

Switched to 0W-40. No issues.

Hmm.. I was fixated on manually calculating my MPG's for the past several times I filled up. I commute about 90 miles per day mostly highway driving. Prior to switching to 0W40, I was getting in the 13~14 MPGs and after the switch to Mobil 1 0W40 this past oil change, the last several 5 or 6 times calculating manually, I got anywhere from 16.5-17.7 MPG. I don't think I have changed my driving habit any. Maybe its a coincidence though. I did also have a supercharger. I will have to see how it is now that it is NA again.

aznboi319 wrote

Hmm.. I was fixated on manually calculating my MPG's for the past several times I filled up. I commute about 90 miles per day mostly highway driving. Prior to switching to 10W60 I was getting in the ~14 MPGs and I recently switched to Mobil 1 0W40 this past oil change and for the last several 5 or 6 times calculating manually I got anywhere from 16.5-17.7 MPG. I don't think I have changed my driving habit any. Maybe its a coincidence though. I did also have a supercharger. I will have to see how it is now that it is NA again.

Automobile engines give up some horsepower to the work required to move oil throughout itself. A thinner oil will free up a little bit of horsepower. I am talking a tiny amount. Therefore your engine is working less to do the same things it would with a thicker oil. Same concept as an aftermarket air intake. Its possible you are a little bit, a very tiny bit, more efficient.

JEllis wrote

Automobile engines give up some horsepower to the work required to move oil throughout itself. A thinner oil will free up a little bit of horsepower. I am talking a tiny amount. Therefore your engine is working less to do the same things it would with a thicker oil. Same concept as an aftermarket air intake. Its possible you are a little bit, a very tiny bit, more efficient.

I haven't driven the car much since I got Godzilla, but I will try to see what the MPG is NA.

The "quicker warm-up" may also be providing some of the mpg improvement.

Just switched to Mobil 1 0w40 today. Hopefully it provides some benefit during the winter months here in Canada.

It is pretty tempting to switch to the 0W-40.

It seems like 0W-40 will be plenty (and probably even better engine protection) for street driving. Hard to justify the slow warmup and cost of 10W-60 if a lighter weight oil properly lubricates the engine when I'm not tracking the car and experiencing sustained increased oil temps.

smmmurf wrote

It is pretty tempting to switch to the 0W-40.

It seems like 0W-40 will be plenty (and probably even better engine protection) for street driving. Hard to justify the slow warmup and cost of 10W-60 if a lighter weight oil properly lubricates the engine when I'm not tracking the car and experiencing sustained increased oil temps.

M1 0w40 is a streetable race oil (Mobil markets it as such). Should work nicely on the track too.

Just to confuse things...if you go to the UK Mobile website:
http://www.mobil.co.uk/UK-English-LCW/carengineoils_which-oil.aspx
it suggests Mobil 1 Extended Life 10W-60 for the E9x M3.
The idea of using a thinner oil for the N. European climate seems appealing...but I hate to find out in 20K miles that it wasn't.

It's now 3 days post switching to Mobil 1 0W40 and it seems to have made an improvement in smoothing cold-weather starts, which is what I was hoping for.
The engine warms up a touch faster and there is much less jerking/lurching in the lower gears prior to proper warm-up. (Sure, it might be placebo or the fact that new oil is being used, but I'm trying to be as objective as possible)
I'm thinking that this oil is a bit kinder/gentler for daily driving

SenorFunkyPants wrote

Just to confuse things...if you go to the UK Mobile website:
http://www.mobil.co.uk/UK-English-LCW/carengineoils_which-oil.aspx
it suggests Mobil 1 Extended Life 10W-60 for the E9x M3.
The idea of using a thinner oil for the N. European climate seems appealing...but I hate to find out in 20K miles that it wasn't.

Why wouldn't it be okay?

SenorFunkyPants wrote

Just to confuse things...if you go to the UK Mobile website:
http://www.mobil.co.uk/UK-English-LCW/carengineoils_which-oil.aspx
it suggests Mobil 1 Extended Life 10W-60 for the E9x M3.
The idea of using a thinner oil for the N. European climate seems appealing...but I hate to find out in 20K miles that it wasn't.

Mobil 1 Extended Life 10W-60
Value
Viscosity, cSt (ASTM D445)
@ 40º C 152.7
@ 100º C 22.7
Viscosity Index 178
Sulfated Ash, wt% (ASTM D874) 1.4
Phosphorous, wt% (ASTM D4951) 0.13
Flash Point, ºC (ASTM D92) 234
Density 15.6ºC g/ml (ASTM D4052) 0.86
Total Base Number (ASTM D2896) 11.8
MRV at -30ºC, cP (ASTM D4684) 25,762
HTHS Viscosity, mPa•s @ 150ºC (ASTM D4683) 5.7

That is even thicker that the tws oil. Dang

This one looks alot better
http://www.mobil.co.uk/UK-English-LCW/carengineoils_products_mobil-1-new-life-0w40.aspx#

Although I keep the car in a climate garage it was 0c when I left for work this morning. I can only image how thick that is at that temp. I see an experiment coming soon.

dparm wrote

Why wouldn't it be okay?

I have no idea...its just the song and dance that BMW make about using the TWS oil - it makes you wonder what they might know but aren't telling us (most likely nothing).
My car will always be under warranty so I'm not that fussed, plus my car is garaged so it never gets that cold - still as I say a lighter weight oil seems to make sense if you aren't tracking....I'm just not going to risk BMW voiding my warranty should my engine go tits up.