To the best of my knowledge, failed oiler tubes won’t cause oil pressure to 
drop in the main gallery, just at the heads and lifters. The typical symptom is 
lifter noise, as the failure of a tube or two causes oil pressure to drop in 
the oil gallery feeding the lifters.

More likely to be a bad oil pressure sender, which is not uncommon in the W140 
chassis.  In fact, I had to change the one on my S420, but more because it was 
leaking.  The gauge was still working properly.  Easy job, takes all of about 
10 minutes if that.

I can find you a set of aluminum oilers if you want, ultrasonically cleaned and 
with new “O” rings. $200 is the going price these days.  I happen to have a set 
sitting in the parts drawer in the garage.  I did them on the SL500, which had 
a couple of bad tubes, and when another set came up for sale I grabbed them 
thinking I might need a set for the S500 or the S420.  So far, neither has had 
the problem.

For what it’s worth, this is a good job to do, especially on higher mileage 
cars, as you can also change out the top chain guides while you’re in there.  
Parts costs besides the oiler tubes is about $150, if that.


> On Jun 8, 2015, at 10:04 PM, Mitch Haley via Mercedes <> 
> wrote:
> Dan Penoff via Mercedes wrote:
>> Yeah, what little I found around the inter web suggests that the pleated 
>> paper filters aren't up for the change intervals and as a result the media 
>> breaks down and fails. Also saw some comments about the fleece, particulate 
>> size, and compatibility with synthetic oils. Interesting.
> My S420 is having bouncing oil pressure gauge issues.
> I hope it's just the sending unit.
> I changed the oil this weekend, and the NAPA filter I took out was no longer 
> round. Not busted, just collapsed a bit. IIRC, it had about 3k mi on i.
> I suppose it's time to take the valve covers off and see if any valve oilers 
> have lost their end caps. (Or is that only the aluminum ones? Mine are 
> plastic)
> Mitch.
> _______________________________________
> To search list archives
> To Unsubscribe or change delivery options go to:


To search list archives

To Unsubscribe or change delivery options go to:

Reply via email to