Please enlighten me as to what it is you are referring to as "natural rubber". I hope you do not mean latex rubber from the rubber tree? I don't think natural has been used for many many decades in automobiles.

Quote:
"Another thing is that, the new ULSD is death to natrual rubber seals and o-rings. It's completely possible that your mechanic replaced the old seals with natural rubber and that they are damaged again. Maybe you should have the seals replaced again but, this time use viton instead of rubber."

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked