I put a bottle of Bitron oel treatment in my 240d, it did ran smoother,
recently I bought many bottles from this dude who used to be a distr. for a purty good price. He was stuck with many of the old packaged item. A new co. started up in BC again. When i was up north many Cowboys thought it was great stuff, except the co. owner fart around and went out of biz.
It does help, my F350 6.9 dsl was starting to sound like a Jamaican steel band, it quieted down tremendously after i down a bottle.

I dont bother to convince my friends about Bitron anymore, it worked out to talk for one whole hour trying to convince them and make 2 bucks, dont give a rats as* if their engine blew up.

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Hey- Another thing I thought of. Make sure vacuum is not going to ALDA. Something I have seen in the past and will kill performance. Nothing is hooked up to ALDA.

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1979 240D Caledonia Green/cream gone
1982 240D stick Ivory/Palimino
1999 E300D White/grey