The manual says something about "light duty"- the maximum time (as measured in days or months) between oil changes if you have driven less than 3k or 5k.

I think it is yearly, but at any rate it is way longer than 3months.

I wouldn't change the filter in that case.

someone else may post with the exact answer...

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84 300TD - 235k - Farbe "Surfblau" bought at 213k
87 300SDL - 131k - Farbe "PimpGold" bought at 115k
00 Klepper Faltboot Expedition Double