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730 Views 3 Replies 3 Participants Last post by  1bad540
hello m5'ers
i am a new owner of a 2003 540i mtech and have been snooping around your forum for awhile. i have been a avid fan of bimmerforums but i thought i would pose the same question to you guys since our cars are similiar.
i just bought this car in amarillo,tx and drove it home to birmingham,al and it performed great. however now that im home and i start it cold i have noticed a loud rattle ike clanking that goes away after 3 or 3 secs. i know there is alittle valve chatter in these cars but this sounds more severe. bmw tech said no worries. i thought the dreaded vanos problems occurred only on the earlier models. i have also heard that the oil pump bolts were know to loosen or back out causing the pump to rattle on start up. my mechanic say that was on earlier models too. the bmw tech say to flush out the amsoil that the earlier owner just put in and go to castrol syn 10w-30. he said the oil alone would quiten it down a bit.
what do you guys think.
that noise scares the bejeezez out of me.


ps::::mileage is 102k
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Discussion Starter · #3 ·
VANOs noise on cold start up is not uncommon for the S2, which is derived from your motor. If it goes away in 2-3 seconds, I wouldn't be concerned. It is simply the oil pressure building up. On the earlier M5's, an accumulator was added to prevent pressure bleed down overnight.

Not sure about the oil pump bolts, I remember something about that, but seems it was on older cars and not the M5. Can it be checked by dropping the oil pan? I wouldn't think that would be very difficult, even if just for your peace of mind.
thanks jerry

after owning a few european cars ie, c43 amg, a few boxters, few m3s...none had high mileage. this has alway been a dream car for me as now i have 2 kids and cant go willy-nilly and spend 35-40k on cars anymore, so i kinda freaked out on the noise issue with 100k miles. your the hundreth one to say, no worries. thanks for your help and advice.
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