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1991 MB 350SD Delvac 1300 - 1000 miles #4940153 11/30/18 09:46 PM
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JHZR2 Offline OP
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Ive discussed in other threads about my recently acquired 1991 Mercedes 350SD with the "rod bender" engine. The head gaskets are known to be weak due to insufficient material in some key places, due to the engine merely being a 3.0L block bored out.

The car had oil in the coolant, just the slightest amount, which could be literally absorbed out of the recovery bottle with a paper towel. But it would readily come back.

In theory, this means that retained coolant pressure would force hot coolant in the oil. In the few thousand miles I drove the car since buying it, it never lost coolant, and the cooling system worked well.

All the same, I pulled a UOA to see if there were signs of coolant in the oil. To my surprise there is not.

[Linked Image]

The soot % is surprising. I do think delvac 1300 has some sodium and potassium in it.

Thoughts?

Re: 1991 MB 350SD Delvac 1300 - 1000 miles [Re: JHZR2] #4940168 11/30/18 09:56 PM
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Meaning the leak takes more than the pressure produced by the cooling system to leak but the higher oil pressure will open it up. Lucky break I would say.


ASE L1, Master. Deutsch Meisterbrief.
Re: 1991 MB 350SD Delvac 1300 - 1000 miles [Re: JHZR2] #4940307 12/01/18 02:34 AM
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Originally Posted by JHZR2
The soot % is surprising. I do think delvac 1300 has some sodium and potassium in it.

I wouldn't think so, but without a VOA from the same lab, not much can be said. Besides, even a tiny amount of residual coolant could have you seeing tiny sodium and potassium numbers like that.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 1991 MB 350SD Delvac 1300 - 1000 miles [Re: Garak] #4940718 12/01/18 02:14 PM
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Originally Posted by Garak
Originally Posted by JHZR2
The soot % is surprising. I do think delvac 1300 has some sodium and potassium in it.

I wouldn't think so, but without a VOA from the same lab, not much can be said. Besides, even a tiny amount of residual coolant could have you seeing tiny sodium and potassium numbers like that.


Perhaps.

PQIA shows Na in it.

http://www.pqiamerica.com/June%202014/ExmoDelvac13001540.htm

Potassium maybe not as much... hmm.

Re: 1991 MB 350SD Delvac 1300 - 1000 miles [Re: JHZR2] #4940970 12/01/18 08:31 PM
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Yes, that tiny amount of sodium, on their VOA, not sure either. That's certain not at an ordinary additive level, at least from a sodium additive package like we're used to seeing. At that level right now, I wouldn't sweat it. You already have a good handle on the issue.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
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