OM642 Oil
#26
B5 is the highest allowable in US to sell as D2 fuel, yet a number of OM642 seized due to oil gelling, on what seems to be 229.51 oils.
How oxidation turns the oil solid would be intriguing to hear.
Any link to Lubrizol article? Sorry for nagging you, but this is phenomena, who created engines lost, so not something you want to take lightly.
How oxidation turns the oil solid would be intriguing to hear.
Any link to Lubrizol article? Sorry for nagging you, but this is phenomena, who created engines lost, so not something you want to take lightly.
#27
MBWorld Fanatic!
Join Date: Jan 2009
Location: V E G A S
Posts: 9,110
Received 1,744 Likes
on
1,391 Posts
1922 Ford Model T / no OBD
I hear new MB diesels allow for B20, but that is future.
Strange as my 2017 Ford Powerstroke allowed B20 and I actually had good results with it. Ford is not hassling customers with special oils, like MB does, but then the 6.7l offer 62HP/l, when MB is reaching 100 HP/l
#28
MBWorld Fanatic!
Join Date: Jan 2013
Location: Toronto, Canada
Posts: 3,720
Received 794 Likes
on
545 Posts
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, C5 Z06 & IS300 race cars, EQE 4Matic+ on order
B5 is the highest allowable in US to sell as D2 fuel, yet a number of OM642 seized due to oil gelling, on what seems to be 229.51 oils.
How oxidation turns the oil solid would be intriguing to hear.
Any link to Lubrizol article? Sorry for nagging you, but this is phenomena, who created engines lost, so not something you want to take lightly.
How oxidation turns the oil solid would be intriguing to hear.
Any link to Lubrizol article? Sorry for nagging you, but this is phenomena, who created engines lost, so not something you want to take lightly.
As for the MB 229.52 oil spec, the first article that came up on Lubrizol was https://360.lubrizol.com/2020/Unders...-Specification. There are others that go into more detail. Google "MB 229.52 oxidation stability" and "MB 229.52 biodiesel"... the top hits are from various oil manufacturers that mention biodiesel compatibility, but it all boils down to oxidation stability. When you Google "biodiesel oxidation", all the hits that you get are about how biodiesel is more prone to oxidation - and the very first hit that you get states "Oxidation of biodiesel leads to the formation of hydroperoxides, which can attack elastomers or polymerize to form insoluble gums. Oxidation products such as hydroperoxides and carboxylic acids can act as plasticizers of elastomers."
Once you take into account the US biodiesel content, oils unable to deal with the resulting amount of oxidation and long OCIs, you have a recipe for disaster and the reason for all the seized / blown OM642s where the oil has gelled up.
Last edited by Diabolis; 11-28-2022 at 11:48 AM.
#29
MBWorld Fanatic!
Join Date: Jan 2009
Location: V E G A S
Posts: 9,110
Received 1,744 Likes
on
1,391 Posts
1922 Ford Model T / no OBD
From dozens of other diesels who are allowed to run on B20.
Once again, any fuel with more than 5% of bio, can no longer be sold as D2. It has to be clearly marked as biofuel.
#30
Super Member
Join Date: Jun 2022
Location: WA State, USA
Posts: 628
Received 282 Likes
on
198 Posts
2014 Cummins, 2014 E250 Bluetec
Low-SAPS HDEO oils allow SAPS content =< 1%, which is what the Rotella T6 meets (MB 229.31 approval). It has to provide sufficient protection for non-ULSD diesel that is available in other countries, and while it is compatible with DPF system, it is not compatible with SCR systems using AdBlue.
Low-SAPS MB 229.51 oils are approved for use in countries with ULSD diesel fuels only, and are compatible with both DPF and SCR exhaust after-treatment systems. IIRC the SAPS contents has to be =<0.8% if not even lower as it also meets Euro 6 standards.
MB 229.52 oils provide some additional fuel efficiency over MB 229.51 oils, and critically for those of you in USA, better oxidation stability for biofuel compatibility (which is what turns the oil into gelatin) over MB 229.51 and all other previous oil approval standards.
Low-SAPS MB 229.51 oils are approved for use in countries with ULSD diesel fuels only, and are compatible with both DPF and SCR exhaust after-treatment systems. IIRC the SAPS contents has to be =<0.8% if not even lower as it also meets Euro 6 standards.
MB 229.52 oils provide some additional fuel efficiency over MB 229.51 oils, and critically for those of you in USA, better oxidation stability for biofuel compatibility (which is what turns the oil into gelatin) over MB 229.51 and all other previous oil approval standards.
Now the biodiesel thing I know requires increased OCIs if you are running over the required manufacturers "limit". I believe in the Cummins its anything over 5% bio (could be 20% been a while since I cared to look) and I dont recall what the new OCI is maybe half of what usual recommendation is. They recommend increased oil level checks as well.
Wanted to add I wonder if the crappy listing of biodiesel content in the US has anything to do with the issues on a engine that apparently is extremely sensitive to it.
#31
MBWorld Fanatic!
Join Date: Jan 2013
Location: Toronto, Canada
Posts: 3,720
Received 794 Likes
on
545 Posts
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, C5 Z06 & IS300 race cars, EQE 4Matic+ on order
Every single OM642 engine that has sludged up and has been taken to a dealer had an oil sample taken out and sent for analysis. All of them have shown significant diesel contamination of the oil.
As for failures in other cars, I have only ever seen this happen in DPF-equipped vehicles that have had repeated failed regen cycles and where the oil and filter were not regularly changed (at 50% of the original OCI if the fuel contained more than B5) or that had another issue like overfuelling. There have been numerous reports of the oil gelling up in VW TDIs for example, and in all cases that I can remember where they did a UOA it was due to diesel in the sump.
As for failures in other cars, I have only ever seen this happen in DPF-equipped vehicles that have had repeated failed regen cycles and where the oil and filter were not regularly changed (at 50% of the original OCI if the fuel contained more than B5) or that had another issue like overfuelling. There have been numerous reports of the oil gelling up in VW TDIs for example, and in all cases that I can remember where they did a UOA it was due to diesel in the sump.
The following users liked this post:
rapidoxidation (11-28-2022)