DIY - E39 525i Fluid Triple Play (PS, diff & tranny fluid change)
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03-23-2011, 10:11 AM
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Mein Auto: 02 BMW 525i M54 automatic
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I added a link to this thread in the bestlinks for future reference.
In addition, I linked to it in the summary fluid printout:
- BMW E39 fluid summary printout for your glovebox (
Doru suggests we replace the fluid in the power steering reservoir at every oil change:
It only takes about half a quart to suction out and then refill:
Most say you can't remove the filter but
some (JimLev) say you can
, so see his DIY on cleaning the filter.
Just make sure you use the right fluid. Do not use PSF; use DexronIII/Dexron VI ATF!
(This was my rookie mistake a few years ago when I first bought my bimmer & changed the fluids.)
Tying the PSF with the oil change makes sense, especially since the o-ring in the cap deteriorates at about the same rate as the two little o-rings in the lower half of the oil filter housing; so replace all three o-rings at the same time (every few years):
At about the same time, check the lower reservoir hose for leaks & fix it the cn90 way:
And, climb underneath to fix the power steering pump hose leaks also:
Otherwise, you face a
power steering pump autopsy
As for the power steering fluid pump filter, here is JimLev's procedure:
E39 (1997 - 2003)
Looks like PS systems are the hot topic today
On the V8 the drain plug on the PS pump will empty almost all of the fluid
There is apparently a screw or bolt holding the filter in place:
Apparently the circular screen will simply lift off at this point:
JimLev suggests you flush it all out with gasoline or other suitable solvent.
He also suggests you plug the filler cap with a Q-tib cotton swab:
But most of us recommend simply replacing the filler cap o-ring every few years.
Last edited by bluebee; 04-15-2011 at
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