I've been reading the archives on blowby but I didn't get a good idea of how much blowby is normal on these engines. So I thought it might be useful to do a survey. I understand there is more than one method of testing blowby, but it seems like loosening the oil cap and observing its motion is the easiest and probably most accurate method. So if you're interested in submitting your results be sure your engine is hot when you do the test as engine temperature will affect the reading. You can also specify the year, model and mileage of your car by replying to this thread. Beware of oil droplets flying out and protect your eyes!

My E300's oil cap just sits there with the occasional twitch, but my 240D's oil cap really dances around. I know they are completely different engines so they probably have different standards of blowby. Please submit your results to the poll only if you have a 616 (240D) or 617 (pre-86 300D/SD) engine. But you can submit results for other engines by replying to this thread.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL