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Old 09-19-2004, 11:24 PM
1968 250SL
Join Date: Sep 2004
Location: Atherton, California
Posts: 15
1972 280 SEL 4.5 oil filter cannister

I recently was offered the chance to buy a 1972 280 SEL 4.5 that had not been operated in 5 years, and I thought it would be a good opportunity to teach my 15 year old son how to work on mechanical things and how to use tools. I spoke to the mechanic who services my cars (and is an American car collector) how to prepare the car before attempting to start it. I did all that and it runs great, but after changing the oil filter there is a slow leak when the engine is operating at the bolt head that retains the canister housing; the seal at the block is not leaking. The bolt has a steel washer on the outside and has a washer/spring arrangement on the inside to position the element. The new (Fram) filter element has a rubber seal on each end, with the large one toward the block; it appears to be identical to the one I removed. I have changed enough car and motorcycle oil that I thought this would be the easy part of the job but as I tell my son, there are always suprises. I would appreciate any suggestions.

Old 09-19-2004, 11:29 PM
Regular User
Join Date: Nov 2002
Location: Flyover State
Posts: 1,364
When you buy the German filters (Knecht, Mann or Hengst) they supply you with a new rubber ring for the groove in the top of the cannister as well as seal rings for bolt. I doubt you get those in a fram kit and would highly recommend using the German filters. They aren't expensive and are available from this site.
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Old 09-20-2004, 11:16 PM
1968 250SL
Join Date: Sep 2004
Location: Atherton, California
Posts: 15

The dealer supplied me with a new aluminum washer for the bolt; the old one was a much used steel washer. I just hit the bolt with a mallet and it came out of the canister and I replaced the washer then refitted the spring/washer combination on the inside.

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