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#4663017 - 02/11/18 02:20 PM Low Viscosity with Mobil 0W40, Concerned?
Stevie Offline


Registered: 11/08/04
Posts: 137
Loc: Port Aransas, TX
Had a good UOA using Mobil Euro 0W40 in 2013 Mercedes SLK230 1.8 liter Turbocharged.
4600 miles with 35,000 total miles on car. Used no oil.
I only do 5K or less on my oil changes not the 10K recommended by MB

SUS Viscosity at 210F is 58.0 should be 64to 74
cST Viscosity at 100C is 9.65 should be 11.3 to 14.3
fuel % <0.5

Comparing this to others using Mobil Euro 0W40 my viscosity seemed to drop a lot.
Blackstone comments were "the low viscosity isn't a problem"
I'm wondering if this turbo engine is especially hard on oil. My previous SLK was a 2.3 liter Supercharged and didn't have low oil viscosity on excellent UOAs.

I'm considering trying Castrol 0W40 Euro with Titanium on next oil change.
Is Titanium an advantage?

What do you guys think?

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#4663043 - 02/11/18 02:45 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
Insertcoolname Offline


Registered: 08/28/17
Posts: 149
Loc: South Texas
Well that 0w40 seems to be a thin 40 to begin with.


M1HM 10w30 reads viscosity at 100 C at 12.1 cst.
M1 0w40 shows 12.9 cst at 100 C

Perhaps is there another oil that meets specs that is like
5w40 or sits a little thicker at operating temp?
I dont think it gets cold enough to NEED a 0w anything in south texas.
_________________________
04 Camry 2az-fe 2.4L 199k M1 HiMi 10w30
Bosch D+ filter

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#4663061 - 02/11/18 03:02 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
WhizkidTN Offline


Registered: 12/05/16
Posts: 468
Loc: E. Tennessee
Originally Posted By: Stevie
Had a good UOA using Mobil Euro 0W40 in 2013 Mercedes SLK230 1.8 liter Turbocharged.
4600 miles with 35,000 total miles on car. Used no oil.
I only do 5K or less on my oil changes not the 10K recommended by MB

SUS Viscosity at 210F is 58.0 should be 64to 74
cST Viscosity at 100C is 9.65 should be 11.3 to 14.3
fuel % <0.5

Comparing this to others using Mobil Euro 0W40 my viscosity seemed to drop a lot.
Blackstone comments were "the low viscosity isn't a problem"
I'm wondering if this turbo engine is especially hard on oil. My previous SLK was a 2.3 liter Supercharged and didn't have low oil viscosity on excellent UOAs.

I'm considering trying Castrol 0W40 Euro with Titanium on next oil change.
Is Titanium an advantage?

What do you guys think?



I had similar results to yours running M1 0W-40 for years in my 2.0L GDI Turbo Kia Optima SX with a similar OCI of under 5K miles.
I switched to Castrol Edge 0W-40 and have been getting better lab results (as per Polaris).

I'd recommend you switch and rerun your testing to see the results.
_________________________
His: '12 Kia Optima SX - 2.0L GDI Twin-Scroll Turbo [Tuned] (69K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (61K)
>EDGE 0W-20, Fram XG6607

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#4663072 - 02/11/18 03:06 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
Trav Offline


Registered: 11/20/06
Posts: 18245
Loc: MA, Mittelfranken.de
Try the Castrol but don't take the first UOA as gospel for anything wear related, it take a few to see a real trend.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

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#4663075 - 02/11/18 03:08 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
Bryanccfshr Offline


Registered: 10/09/04
Posts: 5665
Loc: Durango, Co
If I t is a direct injected turbo you probably have some fuel dilution as well. If the UOA is good I wouldnít sweat it.i run the edge in my bmw but I also have the M1 0w40 in the hopper for a 4 runner.

Btw.
How is the rebuild going in Port A.? I am a corpus native who is landlocked for the past 9years. Hard to shake off the salt in my blood.


Edited by Bryanccfshr (02/11/18 03:08 PM)
_________________________
2018 Trd Pro 4Runner M1 0w40
2018 Tacoma off-road breaking in!

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#4663130 - 02/11/18 03:48 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
JAG Offline


Registered: 10/23/05
Posts: 4662
Loc: Fredericksburg, VA
Itís almost certainly due to a lot of fuel dilution. Does it get a lot of short trips?

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#4663149 - 02/11/18 04:02 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: JAG]
OVERKILL Offline


Registered: 04/28/08
Posts: 35978
Loc: Ontario, Canada
Originally Posted By: JAG
Itís almost certainly due to a lot of fuel dilution. Does it get a lot of short trips?


This.
_________________________
2016 Durango Limited
2016 Grand Cherokee SRT

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#4663205 - 02/11/18 04:49 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
CharlieBauer Offline


Registered: 03/29/16
Posts: 1174
Loc: CA
Are Blackstone known for not measuring fuel dilution correctly?
_________________________
It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain

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#4663623 - 02/12/18 08:52 AM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: CharlieBauer]
OVERKILL Offline


Registered: 04/28/08
Posts: 35978
Loc: Ontario, Canada
Originally Posted By: CharlieBauer
Are Blackstone known for not measuring fuel dilution correctly?


Correct.
_________________________
2016 Durango Limited
2016 Grand Cherokee SRT

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#4663653 - 02/12/18 09:16 AM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: OVERKILL]
2015_PSD Online   content


Registered: 09/26/10
Posts: 7144
Loc: SE Texas
Originally Posted By: OVERKILL
Originally Posted By: CharlieBauer
Are Blackstone known for not measuring fuel dilution correctly?


Correct.
+1 - their methodology allows for subjective analysis. Try using Polaris in the future.
_________________________
2018 MB AMG GLC43 3.0L Coupe - M1 0W-40/OEM
2018 MB C300 2.0L - Factory Fill
2015 F-250 6.7L PS Diesel - Delo 5W-40/CQ Blue
2014 Explorer 3.5L Limited - M1 AFE 0W-20/FU

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#4663681 - 02/12/18 09:37 AM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: JAG]
mightymousetech Offline


Registered: 04/03/17
Posts: 1314
Loc: Ontario, Canada
Originally Posted By: JAG
Itís almost certainly due to a lot of fuel dilution. Does it get a lot of short trips?


Came to ask the same.
_________________________
Mighty Mouse Tech
Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL

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#4663684 - 02/12/18 09:41 AM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
zeng Offline


Registered: 09/01/15
Posts: 2095
Loc: Malaysia
It's GDI.
The oil probably fuel dilutes, other than shear thinning ..

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#4663852 - 02/12/18 11:55 AM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
Stevie Offline


Registered: 11/08/04
Posts: 137
Loc: Port Aransas, TX
Thanks for everyones input! You guys are so smart! My trip to work is 9 miles each way. Most road trips are taken in my wife's Hyundai since my SLK won't hold us and our dog.

How far of a drive would I need to burn off the fuel dilution every month or so?

I guess the dilution isn't hurting my engine or turbo if I keep the oil changes around 5K?

Mobil 1 0W/40 or Castrol Euro 0W/40? What about that Titanium in the Castrol?

Sorry about all the questions, but I would like to keep this SLK for a long time as I really love it. I want to do everything I can to treat it right.

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#4663861 - 02/12/18 12:02 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
SHOZ Offline


Registered: 06/28/03
Posts: 5603
Loc: Illinois
I get fuel dilution on my non GDI Gen Coupe turbo. They have loose rings. One guy on the forum was surprised as instead of using oil the level increased. Mine uses no oil at all in 5k miles, I assume it does and the fuel is replacing whatever is burnt.
_________________________
2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4663966 - 02/12/18 02:07 PM Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie]
WhizkidTN Offline


Registered: 12/05/16
Posts: 468
Loc: E. Tennessee
Originally Posted By: Stevie
Thanks for everyones input! You guys are so smart! My trip to work is 9 miles each way. Most road trips are taken in my wife's Hyundai since my SLK won't hold us and our dog.

How far of a drive would I need to burn off the fuel dilution every month or so?

I guess the dilution isn't hurting my engine or turbo if I keep the oil changes around 5K?

Mobil 1 0W/40 or Castrol Euro 0W/40? What about that Titanium in the Castrol?

Sorry about all the questions, but I would like to keep this SLK for a long time as I really love it. I want to do everything I can to treat it right.



I switched from M1 0W-40 in my GDI turbo 2.0L Kia Optima SX to Castrol Edge 0W-40 for this reason. My Polaris reports show a vast reduction in oxidation and less viscosity loss after similar OCI and driving style/mix. My fuel dilution is correctly measured by Polaris as greater than 5% with both oils. My conclusion is that the Castrol holds up better in my hot little GDI turbo engine.
_________________________
His: '12 Kia Optima SX - 2.0L GDI Twin-Scroll Turbo [Tuned] (69K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (61K)
>EDGE 0W-20, Fram XG6607

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