Mine started quite a bit easier after the adjustment, I recall all but one were too tight. Can't recall about top end power... I know the manual boost controller made a large difference in power going from 8psi to 12psi

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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