What is the purpose of the tube that runs down the center of my oil filter housing on my 95 E300D? My 83 300D dosen't have this tube. What dose it do and when should the two rubber O-rings be changed? Jay

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Thank you, Jay
83MB 300D 241K "The silver coffin"
10 Prius lll 1K
95 MB E300D 120K Mable
02 Saab 9-5 Areo 131K
Cannondale SR500
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