Third time is the charm. I ran it after reducing the tension and got a max of 11. 13 felt a lot better. Brought it back up. Will boost to 13 in 2nd and ~14 in third. I am leaving it like that.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.