I'm trying to solve my lack of turbo kick and cleaned the banjo bolt and banjo fitting at the intake manifold over the weekend. They were clogged and definitely needed cleaning. When I did that same cleaning job on my 300D a decade ago, that restored my acceleration performance. It didn't work on the 300SD. However, I noticed that someone must have been in there before because only one washer was present on the intake manifold side. I don't know if that one washer missing could cause a small leak between the fitting and the bolt head, but that washer was there for a reason and I want to try that first before I move to other areas to check. I could go to the dealer and special order the exact washer for $3 and wait a few days for it arrive from the warehouse, but maybe I can use something off the shelf. The original washer is copper and the measurements are 11.5mm x 8mm x 1mm. Is it that critical than I get the exact size washer or can I get away with another size? Seems like as long as I'm close to the ID and OD, I'll be ok.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.