Tyler's suggestions are very good. Diesels like to be driven hard - they
like to be driven long distances and to be fully warmed up. Short trips at
moderate/slow speeds are bad on diesels as well as gas engines as that kind
of driving doesn't get the oil warmed enough to burn off any condensation
that will naturally form in all engines. If it's not burned of it stays and
mixes with the oil reducing the oils ability to lubricate.
If it were me, I'd change the oil to the M1 5W40 mentioned and add the
proper amount of Marvel Mystery Oil (a long time favorite of mine) to help
free the rings. While it;s true the Mobil has its own additives, a little
extra once in a while - especially on an older engine will help it along.
Some will say the MMO is not needed - to each his own.
When an engine gets old one of the inescapable problems will be hard
starting in the winter - my 78 240D only used a quart of oil every 2000 mi
or so - and it didn;t have visible smoke except at night when I revved it
out and there were headlights behind me - then one cold day it would not
start no matter what I did. Turned out to have almost zero compression on 3
of 4 cylinders. When I rebuilt it I found the 3 bad cylinders all had a
broken top ring - the pistons and liners were all replaced.
The point of the above is - the engine seemed fine until one day when it
would no longer start - from OK to bad in 1 day/
It's possible Tyler is right about the rings being stuck - once they are
loosened the oil burning may stop or be reduced.
IMO your family is much safer in a older MB than a new Ford ---
Good luck
LarryT
78 240D
91 300D
----- Original Message -----
From: "tyler" <casi...@usermail.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, June 03, 2009 1:59 PM
Subject: Re: [MBZ] our 190D starts to burn oil
You'd probably be better off with 5w40 Turbo Diesel Truck than 15w50.
There's a good chance that your oil burning is caused by stuck rings. I
would try to run it hard as often as possible, and keep running Mobil 1
(hopefully 5w40). The carbon could clean out, and your compression return.
If your crankcase breather is clogged, it can also cause the blowby gases
to force out past the oil seals, and make the engine blow oil out on the
ground. This could be the cause of your oil loss, and the blue smoke could
be an injection system issue.
I suppose it is possible for the engine to be just worn out also, with
300k miles!
Tyler
Zoltan Finks wrote:
We changed to Mobil 1 15/50 oh, maybe two months and a couple thousand
miles
ago, maybe a bit less.
We haven't been driving it very hard I think. My wife probably drives it
moderately - pushes the pedal as hard as she needs to to get it up hills
without falling behind. She accelerates with the normal flow of traffic.
But
nothing considered hard driving.
Yes, the thing was running too cool since we got it. I changed the
thermostat, oh, maybe 5 months and 3 - 4 thousand miles ago? Maybe less.
I have to say this is a glimmer of hope. I tend to be fatalistic about
our
cars especially when they have 300k mi. on them.
Not being that mechanically inclined, or at least experienced, I am just
sick and tired of worrying about our cars. So at this point I am just
throwing my hands up and saying let's get a newer reliable car and I will
no
longer be on worry patrol.
We have been looking at Civics, and lusting after a new Insight.
Now we got advice to look into a new Ford Focus - especially in the
current
auto market.
Of course, I also was thinking about fixing the engine and keeping the
190,
because we love it and already own it. And it's a classic (in my mind)
and
drives and handles great and is more classy and unique than some run of
the
mill newer car.
Thoughts?
Brian
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