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Low Viscosity with Mobil 0W40, Concerned? #4663017
02/11/18 02:20 PM
02/11/18 02:20 PM
Joined: Nov 2004
Posts: 251
Port Aransas, TX
Stevie Offline OP
Stevie  Offline OP
Joined: Nov 2004
Posts: 251
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?

Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663043
02/11/18 02:45 PM
02/11/18 02:45 PM
Joined: Aug 2017
Posts: 173
South Texas
Insertcoolname Offline
Insertcoolname  Offline
Joined: Aug 2017
Posts: 173
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 209k
M1 5w30
PremiumGuard filter
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663061
02/11/18 03:02 PM
02/11/18 03:02 PM
Joined: Dec 2016
Posts: 531
E. Tennessee
WhizkidTN Offline
WhizkidTN  Offline
Joined: Dec 2016
Posts: 531
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] (77K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (77K)
>EDGE 0W-20, Fram XG6607
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663072
02/11/18 03:06 PM
02/11/18 03:06 PM
Joined: Nov 2006
Posts: 20,765
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,765
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.
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663075
02/11/18 03:08 PM
02/11/18 03:08 PM
Joined: Oct 2004
Posts: 5,895
New Braunfels
Bryanccfshr Offline
Bryanccfshr  Offline
Joined: Oct 2004
Posts: 5,895
New Braunfels
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.

Last edited by Bryanccfshr; 02/11/18 03:08 PM.

2018 Trd Pro 4Runner
2018 Tacoma off-road

Dealer 0w20 to M1 0w40 FS -it depends
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663130
02/11/18 03:48 PM
02/11/18 03:48 PM
Joined: Oct 2005
Posts: 5,128
Fredericksburg, VA
JAG Offline
JAG  Offline
Joined: Oct 2005
Posts: 5,128
Fredericksburg, VA
Itís almost certainly due to a lot of fuel dilution. Does it get a lot of short trips?

Re: Low Viscosity with Mobil 0W40, Concerned? [Re: JAG] #4663149
02/11/18 04:02 PM
02/11/18 04:02 PM
Joined: Apr 2008
Posts: 38,244
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 38,244
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.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663205
02/11/18 04:49 PM
02/11/18 04:49 PM
Joined: Mar 2016
Posts: 1,255
CA
CharlieBauer Offline
CharlieBauer  Offline
Joined: Mar 2016
Posts: 1,255
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
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: CharlieBauer] #4663623
02/12/18 08:52 AM
02/12/18 08:52 AM
Joined: Apr 2008
Posts: 38,244
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 38,244
Ontario, Canada
Originally Posted By: CharlieBauer
Are Blackstone known for not measuring fuel dilution correctly?


Correct.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: OVERKILL] #4663653
02/12/18 09:16 AM
02/12/18 09:16 AM
Joined: Sep 2010
Posts: 7,596
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,596
Planet Earth
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.

Re: Low Viscosity with Mobil 0W40, Concerned? [Re: JAG] #4663681
02/12/18 09:37 AM
02/12/18 09:37 AM
Joined: Apr 2017
Posts: 1,494
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,494
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
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663684
02/12/18 09:41 AM
02/12/18 09:41 AM
Joined: Sep 2015
Posts: 2,530
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,530
Malaysia
It's GDI.
The oil probably fuel dilutes, other than shear thinning ..

Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663852
02/12/18 11:55 AM
02/12/18 11:55 AM
Joined: Nov 2004
Posts: 251
Port Aransas, TX
Stevie Offline OP
Stevie  Offline OP
Joined: Nov 2004
Posts: 251
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.

Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663861
02/12/18 12:02 PM
02/12/18 12:02 PM
Joined: Jun 2003
Posts: 5,973
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,973
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
Re: Low Viscosity with Mobil 0W40, Concerned? [Re: Stevie] #4663966
02/12/18 02:07 PM
02/12/18 02:07 PM
Joined: Dec 2016
Posts: 531
E. Tennessee
WhizkidTN Offline
WhizkidTN  Offline
Joined: Dec 2016
Posts: 531
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] (77K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (77K)
>EDGE 0W-20, Fram XG6607
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