That's a great idea... just put it into a spreadsheet and organize with a column for date and mileage, so that it's easy to sort. Even if you don't know what the code means, still put it on the sheet and look it up later. Might take a while but it'll save you time and money down the road.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau