5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
Over the last few weeks my 5 series ahs developed a knock on start up, it does not always happen but it seems to be getting more frequent. It last just a few seconds and length of time it lasts for varies too. Once started there is not evidence of a knock. If the car is restarted immediately there is no knock. The car has covered 78k and has a good service history.
I had wondered if itís a hydraulic valve thatís losing pressure over a few hours, once the engine has been started the valve is brought up to pressure.
Any ideas what may be ?
If it is a hydraulic valve how easy is it to locate which one, and replace it ?
Car was serviced last october, but i have only completed 2 to 3k since, the problem has only exsisted month or so after the service, and has increasingly got worse. May be it be down to the oil used (main agent) it is goes in to the serving garage on monday to be checked out, i should ask what oild was used.
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