Can you post a video with sound of your starter? I can tell by the sound if your starter is spinning fast enough or not, that could nail it down to the starter or battery. Synthetic oil I assume?

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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