I need to change the oil in my W123, And there are a few thing you have probably missed.
#1 is that there is a VAST difference in the quality of various oil filters, get a quality one with the bypass media.
#2 is you need to change the orings on the oil filter housing stalk.
#3 is don't torque the drain plug to 40Nm even though that is the spec in the service manual, you will most likely either strip the oil pan, or your drain plug.

Well, that's all the exciting parts I suppose.

0:00 Introduction
0:30 What you need
1:17 Wix filter vs Mann filter
3:07 Oil cap ORings
3:47 Remove drain plug
4:32 Filter cap removal
5:08 Orings on filter stalk
5:35 Chipping Orings off & replacing
7:50 Change filter
10:48 Reinstall drain plug
11:28 Spec in manual is 40N⋅m. Do not use that spec.
12:30 Proper torque spec is Gutentight.
13:24 Oil capacity spec is 8L
14:00 7.5L added
14:23 Start engine, check oil level afterward
14:50 8L is spot on for capacity.


Here are a few things you might want for the maintenance on your OM617:

➡Oil filter (Mann): https://amzn.to/3B4FB4G
➡Oil filter (Mahle): https://amzn.to/3nIX8MW
➡Oil filter stalk orings: https://amzn.to/3HTovKZ
➡Viton filter stalk orings (higher temp rating): https://amzn.to/460NwOD
➡Oil (Buy locally, likely far better prices at your local autoparts place): https://amzn.to/3jRrC7t ➡(Synthetic option: https://amzn.to/43fwWJ8)
➡Fuel filter (Spin on): https://amzn.to/3M7fFMc
➡Fuel filter (Inline): https://amzn.to/42kjaog
➡Air filter: https://amzn.to/3HQtM6f

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