31 AUGUST 2026 · BMW
Ask anyone who has owned an E46 M3 what the first question is when buying one, and you will get the same answer: when were the rod bearings done. It is the right question. The follow up question, which gets asked far less often, is what the answer is supposed to look like on paper.
An S54 rod bearing job is invasive, expensive and easy to describe without having done. It is also the single line in the folder that most changes what the car is worth. That combination is exactly where documentation deserves scrutiny.
The connecting rod bolts are single use. They are torqued past their elastic limit, and they do not go back in. Any competent shop replacing rod bearings buys new rod bolts as a matter of course, and they appear on the parts list as their own line, priced separately from the bearing shells.
So: an invoice that lists bearing shells and no rod bolts is describing either a job done wrong or a job described loosely by someone who was not holding the parts. Neither is what you want under a car you are about to buy. This is the most useful single test in the whole folder, and it takes ten seconds to apply.
Parts: rod bearing shells x6 · connecting rod bolts x12 · sump gasket · oil filter · engine oil 5W-30 · Labour: sump removal, bearing replacement, refit. Odometer 142,880 km.
The rod bearing invoice is the headline, but two other things should be visible in a well kept history, and their absence changes how much you trust the rest:
Oil change frequency matters too, and here the folder tells you more than any single invoice does. Bearing wear on this engine is associated with long intervals and the wrong oil. A stack of receipts at sensible mileages is itself an argument about how the car was treated, in a way that no summary sheet can be.
New rod bolts on the parts list, oil and filter, a sealing item for the sump, a named bearing specification, and an odometer reading. Five things. If the invoice has them, the claim is real. If the folder offers only a line reading "rod bearings replaced", you have a sentence, and sentences are not evidence.
What makes both this and the Porsche IMS question tractable is that the job leaves a footprint. Real work consumes consumables, occupies labour hours and happens at a mileage. An invoice that fails to account for the footprint is describing something other than the work.
It is the same reading you should apply to a stamped service book, which is the most trusted and least informative document in the European used car market.
I built Palmarès because my own car arrived with a previous owner's folder and no way to tell, quickly, which parts of it were evidence. It files a car's history on an iPhone and marks every entry as receipted, transcribed or stated, so the distinction survives into the dossier you hand the next owner. It reads documents on the device, keeps them in your own iCloud, and has no account to create.