High viscosity, last 30K miles.
Thread Starter
MBWorld Fanatic!
Joined: Apr 2016
Posts: 1,124
Likes: 205
From: NW
2018 GLC 4MATIC
High viscosity, last 30K miles.
Hello all,
looking for advice, what could cause viscosity to go up?
History:
Started at 72K miles, viscosity started to go up, so far it went up and stays there:
SUS Viscosity @ 210°F = 65.9 (AVG 54-65)
cSt Viscosity @ 100°C = 11.85 (AVG 8.5-11.9)
Prior to 72K (values were from 61.7 to 64.2 for SUS Viscosity @ 210°F, and 10.71 - 11.85 for cSt Viscosity @ 100°C)
92K Miles
SUS Viscosity @ 210°F = 66.5
cSt Viscosity @ 100°C = 12.01
100K Miles
SUS Viscosity @ 210°F = 66.4
cSt Viscosity @ 100°C = 12.00
BlackStone commented "The viscosity actually read just a little thick for a 5W/30, but maybe that's due to soot. It's just barely out of line, and the rest of the results look great"
I'm still using the same MB 5W/30 oil from the same supplier, changing intervals 3-3.5K Miles, and getting fuel from the same gas station 95% times.
Any idea why it went up and what to expect from high viscosity?
If it's due to soot, I'm afraid it's not so good.
Thank you in advance.
looking for advice, what could cause viscosity to go up?
History:
Started at 72K miles, viscosity started to go up, so far it went up and stays there:
SUS Viscosity @ 210°F = 65.9 (AVG 54-65)
cSt Viscosity @ 100°C = 11.85 (AVG 8.5-11.9)
Prior to 72K (values were from 61.7 to 64.2 for SUS Viscosity @ 210°F, and 10.71 - 11.85 for cSt Viscosity @ 100°C)
92K Miles
SUS Viscosity @ 210°F = 66.5
cSt Viscosity @ 100°C = 12.01
100K Miles
SUS Viscosity @ 210°F = 66.4
cSt Viscosity @ 100°C = 12.00
BlackStone commented "The viscosity actually read just a little thick for a 5W/30, but maybe that's due to soot. It's just barely out of line, and the rest of the results look great"
I'm still using the same MB 5W/30 oil from the same supplier, changing intervals 3-3.5K Miles, and getting fuel from the same gas station 95% times.
Any idea why it went up and what to expect from high viscosity?
If it's due to soot, I'm afraid it's not so good.
Thank you in advance.
Out Of Control!!
Joined: Sep 2018
Posts: 14,695
Likes: 4,586
From: unbegrenzt
2017 GLE350 4MATIC
Less than 1% variation is nothing. Well within measurement variation for this situation. Blackstone could have calibrated their test machines, or it could be a different technician that conducted the test, or a thousand other variations.
Senior Member
Joined: Jul 2017
Posts: 487
Likes: 114
From: DFW, TX
Ml350 bluetec
Hello all,
looking for advice, what could cause viscosity to go up?
History:
Started at 72K miles, viscosity started to go up, so far it went up and stays there:
SUS Viscosity @ 210°F = 65.9 (AVG 54-65)
cSt Viscosity @ 100°C = 11.85 (AVG 8.5-11.9)
Prior to 72K (values were from 61.7 to 64.2 for SUS Viscosity @ 210°F, and 10.71 - 11.85 for cSt Viscosity @ 100°C)
92K Miles
SUS Viscosity @ 210°F = 66.5
cSt Viscosity @ 100°C = 12.01
100K Miles
SUS Viscosity @ 210°F = 66.4
cSt Viscosity @ 100°C = 12.00
BlackStone commented "The viscosity actually read just a little thick for a 5W/30, but maybe that's due to soot. It's just barely out of line, and the rest of the results look great"
I'm still using the same MB 5W/30 oil from the same supplier, changing intervals 3-3.5K Miles, and getting fuel from the same gas station 95% times.
Any idea why it went up and what to expect from high viscosity?
If it's due to soot, I'm afraid it's not so good.
Thank you in advance.
looking for advice, what could cause viscosity to go up?
History:
Started at 72K miles, viscosity started to go up, so far it went up and stays there:
SUS Viscosity @ 210°F = 65.9 (AVG 54-65)
cSt Viscosity @ 100°C = 11.85 (AVG 8.5-11.9)
Prior to 72K (values were from 61.7 to 64.2 for SUS Viscosity @ 210°F, and 10.71 - 11.85 for cSt Viscosity @ 100°C)
92K Miles
SUS Viscosity @ 210°F = 66.5
cSt Viscosity @ 100°C = 12.01
100K Miles
SUS Viscosity @ 210°F = 66.4
cSt Viscosity @ 100°C = 12.00
BlackStone commented "The viscosity actually read just a little thick for a 5W/30, but maybe that's due to soot. It's just barely out of line, and the rest of the results look great"
I'm still using the same MB 5W/30 oil from the same supplier, changing intervals 3-3.5K Miles, and getting fuel from the same gas station 95% times.
Any idea why it went up and what to expect from high viscosity?
If it's due to soot, I'm afraid it's not so good.
Thank you in advance.
Thread Starter
MBWorld Fanatic!
Joined: Apr 2016
Posts: 1,124
Likes: 205
From: NW
2018 GLC 4MATIC
Originally Posted by Etienne Lau
What kind of distance you travel on average per trip? Maybe too many short trips creating more soot?
On weekends it can be a few hundreds miles highway trips.
Im in this schedule past 5 years, and viscosity numbers went up about 1.5 years ago.
