Sorry. I was in the middle of editing my post when you replied. Reread it & see if it makes any more sense. I'd hate to see you spend money in the wrong direction before a complete diagnosis.

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82 300SD 202K
82 300SD 233K
83 300TD 340K
82 300TD 98k euro (parts on the hoof)
85 300TD 282K
83 300TD 197K