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Old 08-18-1999, 02:00 AM
mbz owner
Posts: n/a

Something I'd like other 300SD owners to be awaare about...make sure your oil cooler lines are in good shape. I thought I had solved this by replacing both my lines, with German OEM aftermarket replacements...however, few months ago the upper line came apart at the junction between the hose and the fitting, leaving the engine with 0 oil pressure...luckily I stopped the car within a few seconds and everything was fine...but make sure you have a good set of oil cooler lines, otherwise you could lose your investment in a matter of seconds!

Old 08-18-1999, 11:28 PM
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Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,935

Yes, good point! You also have to be careful when loosening the upper line after it has been on there awhile. It is very easy to strip out the threads. A quick test 'just to make sure' yours isn't leaking is to just swipe your finger under the fitting (on the hose) and see if there's any oil on your finger. If there is, have the cooler and related lines R&R'd immediately. Oh, be careful, it will be hot!!

Aaron Greenberg
MB technician
'67 250SE Cabriolet
'77 450SL
'79 6.9
'79 6.9
'80 300SD
'81 240D
'85 380SE
'89 420SEL
'93 300E 2.8
Old 08-19-1999, 09:36 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Also I have seen the faulty engine mounts cause the P/S pump belts cut into the lines and cause failure! Good topic but what a messy job!!


Old 08-23-1999, 12:59 AM
Posts: n/a

Maybe I've jinxed myself by starting this topic, but my other car blew its upper oil line today...luckily the engine is okay (I've temporarily fastened the hose with a clamp. It came apart at the junction btwn the upper oil cooler line towards the radiator (where the rubber hose connects to the metal fitting).

This had happened on my other 300SD, so I replaced the hoses on this car with genuine MBZ hoses 3 months ago (I took care not to damage the hose when installing it). The car has 132K miles, new belts, and engine mounts. This i sthe first such problem for this car.

Why would a genuine MBZ hose only 3 months old fail? Is it likely the hose or could something else be wrong with the oil cooler circuit? I use german oil filters, Mobil 1 15W50 oil.

The hose does NOT have markings where the belt simply came apart at the metal fitting!

Anyway I probably will have the dealer do the job this time.

[This message has been edited by mbzowner (edited 08-23-1999).]
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