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1985 Merrcedes 300D, 5,900 mi., T5 10w30 #5456472 06/17/20 11:07 PM
Joined: Apr 2016
Posts: 1,233
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Alex_V Offline OP
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The first UOA I've done on an OM617 or this oil - very pleased! Also reaffirms my hunch that 40 weights aren't a necessity in these engines like a lot of the owners preach. This OCI had a pretty varied operation schedule - lots of short trips, 1000+ miles of 70-80 MPH highway running, and a few stints of very spirited backroad running.

F89EDED2-8F83-4866-BBC7-11FCE1E483CF.jpeg
Last edited by Alex_V; 06/17/20 11:09 PM.

'85 GMC C3500, 454, 132K
'67 Suburban, 350, 331K
'78 Mercedes 300D, OM617 NA, 151K
'82 Mercedes 300CD, OM617 turbo, 173K
'85 Mercedes 300TD, OM617 turbo, 241K
'85 Mercedes 300D, OM617 turbo, 152K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: Alex_V] #5456562 06/18/20 05:50 AM
Joined: Dec 2005
Posts: 14,557
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kschachn Offline
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Originally Posted by Alex_V
The first UOA I've done on an OM617 or this oil - very pleased! Also reaffirms my hunch that 40 weights aren't a necessity in these engines like a lot of the owners preach. This OCI had a pretty varied operation schedule - lots of short trips, 1000+ miles of 70-80 MPH highway running, and a few stints of very spirited backroad running.

You do realize however that since this oil carries MB-Approval 228.31 has a minimum HTHS of 3.5? As a result the difference between a 30-grade and a 40-grade designation is a bit meaningless in this instance.

Rotella calls this oil "low HTHS" but that is in reference to some of their other oils and for some of the competition, it's not exactly low HTHS in the overall scheme of things related to passenger car diesel oils.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: Alex_V] #5456640 06/18/20 07:52 AM
Joined: Jun 2003
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Chris142 Offline
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Originally Posted by Alex_V
and a few stints of very spirited backroad running.

What do you consider "very spirited" lol. I got one of those cars stuck in the pothole in front of my work.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: Chris142] #5456669 06/18/20 08:26 AM
Joined: Apr 2016
Posts: 1,233
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Alex_V Offline OP
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Repeated WOT pulls from 3,500-4,500 over the course of a given drive.


'85 GMC C3500, 454, 132K
'67 Suburban, 350, 331K
'78 Mercedes 300D, OM617 NA, 151K
'82 Mercedes 300CD, OM617 turbo, 173K
'85 Mercedes 300TD, OM617 turbo, 241K
'85 Mercedes 300D, OM617 turbo, 152K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: kschachn] #5456676 06/18/20 08:29 AM
Joined: Apr 2016
Posts: 1,233
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Alex_V Offline OP
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Originally Posted by kschachn
You do realize however that since this oil carries MB-Approval 228.31 has a minimum HTHS of 3.5? As a result the difference between a 30-grade and a 40-grade designation is a bit meaningless in this instance.


How so? (Inquiring, not doubting.) It's supposed to start out at a 12, and most 40 weight diesel oils I've looked at are ~14-15.


'85 GMC C3500, 454, 132K
'67 Suburban, 350, 331K
'78 Mercedes 300D, OM617 NA, 151K
'82 Mercedes 300CD, OM617 turbo, 173K
'85 Mercedes 300TD, OM617 turbo, 241K
'85 Mercedes 300D, OM617 turbo, 152K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: kschachn] #5456693 06/18/20 08:40 AM
Joined: Dec 2002
Posts: 44,289
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JHZR2 Offline
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Originally Posted by kschachn
Originally Posted by Alex_V
The first UOA I've done on an OM617 or this oil - very pleased! Also reaffirms my hunch that 40 weights aren't a necessity in these engines like a lot of the owners preach. This OCI had a pretty varied operation schedule - lots of short trips, 1000+ miles of 70-80 MPH highway running, and a few stints of very spirited backroad running.

You do realize however that since this oil carries MB-Approval 228.31 has a minimum HTHS of 3.5? As a result the difference between a 30-grade and a 40-grade designation is a bit meaningless in this instance.

Rotella calls this oil "low HTHS" but that is in reference to some of their other oils and for some of the competition, it's not exactly low HTHS in the overall scheme of things related to passenger car diesel oils.


+1.

Straight 30wt oils have always been allowed in certain temperature ranges.

The matter of 40wt oils is more about getting the right diesel-specific add pack, and a good level of ZDDP in there for these (somewhat) flat tappet cams.

Im interested to see how low the soot loading is for this duration.


Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: Alex_V] #5456720 06/18/20 09:16 AM
Joined: Dec 2005
Posts: 14,557
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kschachn Offline
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Originally Posted by Alex_V
How so? (Inquiring, not doubting.) It's supposed to start out at a 12, and most 40 weight diesel oils I've looked at are ~14-15.

This might help:

https://360.lubrizol.com/2019/Visco...s-the-Difference-and-Why-is-it-Important

HTHS is a better indicator of the oil's actual performance in use and it is what the approval dictates as a requirement. This is another reason why approvals are important and significant.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: JHZR2] #5456920 06/18/20 12:27 PM
Joined: Apr 2016
Posts: 1,233
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Alex_V Offline OP
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Originally Posted by JHZR2
Im interested to see how low the soot loading is for this duration.



The "fuel" value at the bottom is the indicator of soot loading, yes? I know the primary limitation of OCI's in these IDI's is soot loading. It would be on the high side of its potential since a good 30-40% of the hours on this oil was low-speed town driving in cold weather, with many trips under 5 miles. This engine has about 7,000 mi. on new injectors and rarely smokes enough to be visible in daylight even when looking at the tailpipe. A good portion of this interval also had a consistent dose of Hotshot's EDT in the fuel tank.

Last edited by Alex_V; 06/18/20 12:30 PM. Reason: typo

'85 GMC C3500, 454, 132K
'67 Suburban, 350, 331K
'78 Mercedes 300D, OM617 NA, 151K
'82 Mercedes 300CD, OM617 turbo, 173K
'85 Mercedes 300TD, OM617 turbo, 241K
'85 Mercedes 300D, OM617 turbo, 152K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: kschachn] #5456922 06/18/20 12:28 PM
Joined: Apr 2016
Posts: 1,233
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Alex_V Offline OP
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Originally Posted by kschachn
This might help:

https://360.lubrizol.com/2019/Visco...s-the-Difference-and-Why-is-it-Important

HTHS is a better indicator of the oil's actual performance in use and it is what the approval dictates as a requirement. This is another reason why approvals are important and significant.


Thank you! Good info.


'85 GMC C3500, 454, 132K
'67 Suburban, 350, 331K
'78 Mercedes 300D, OM617 NA, 151K
'82 Mercedes 300CD, OM617 turbo, 173K
'85 Mercedes 300TD, OM617 turbo, 241K
'85 Mercedes 300D, OM617 turbo, 152K
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: Alex_V] #5458201 06/20/20 04:02 AM
Joined: Aug 2009
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I have Rotella Diesel 10w30 in my 76 300D. WOT is practically the only way to drive a 300D


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 Euro L
76 Mercedes 300D Rotella T4
Series III Land Rover VWB
02 Yukon 10w30 PP
01 P71 M1 EP-HM 0W20
95 Accord - 386k. Mobil 2 RIP
Re: 1985 Merrcedes 300D, 5,900 mi., T5 10w30 [Re: Alex_V] #5458619 06/20/20 04:14 PM
Joined: Jul 2013
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billpace1956 Offline
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That Hotshot stuff is what I use. I think it is really good stuff. I have used it for over 2 years when my mechanic told me he used it and it has worked great for both of us. It should work great for you also! I also think you could go about 10,000 miles on your 10w-30 diesel motor oil. The limit is 2% soot for Mercedes. I went 15,000 miles on Amsoil 14w-40 diesel motor oil (AME) the soot level was 1.7%. This was on my 1984 300sd. I went 6110 miles on my 1983 Mercedes 240d and the soot level was 1.2%. The oil was 5w-40 T6 by shell. Maybe you should try using a UOA and then know for sure. I went 15,000 miles on my 1995 e300d with Amsoil 15w-40 AME diesel oil and the soot level was .2%. Of course, that car has a different injection system! Take care! Bill

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