You might want to try using diesel rated oil for a change or two. I believe it was Larry Bible made this suggestion. I did it for the old 87 190e I had and it did improve a noisey lifter.

The diesel rated oil has better detergents and thus cleans the inside of engines better.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)