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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 02-12-2009, 09:46 PM   #1
marcochavez73
 
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Name: marcochavez73
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Your Ride: 2003 BMW 525I
Tune up for a BMW 525I 2003

Can some one tell me what I need to do for a major tune up Please. For a BMW 525I...
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Old 02-22-2009, 09:12 AM   #2
TrickyRickyRican

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Your Ride: 2000 528i
Well, it all depends on how many miles do you currently have on your car. Low/high miles usually determines the extent of work to be done.

1. Basic (regardless of milage):
Plugs; oil/oil filter(if necessary); air filter; clean Mass Air Flow sensor
2. Intermediate (also around 50k miles):
Same as above plus you need to start looking for and inspect the cooling system, belts; cabin filters; start looking for possible power steering reservoir leaks around the hoses; grease/lube suspension components.
3. Advanced (also around 100k miles): Same as above plus now you may be well advised to look at replacing at least the pre-cat o2 sensors; fuel filter; MAF; valve cover gasket (this could happen sooner in a car's life, look for leakege around 60k); Vanos o-ring replacement (again this may need to be done as soon as 40k)

Also 100k plus vehicles may benefit from a transmission filter change (automatic), differential gear oil change

This is what I've done/gathered from reading and paying attention to countless posts on the web and fellow E39 owners' experiences, of course the wallet always plays a major role on these type of deals so plan ahead and think of it as preventative maintenance not just a tune-up

I hope this helps.
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