Air suspension: This is probably rear air-lift shockers, or Monroe Ride Levellers....
I will check for my dad but I think you are right they are probably air lift shockers.
Chipping: A definate 'must do'!
The BMW M51D was detuned to 128 BHP for the Omega, but chipping sends it back to BMW's lively 143 BHP. 'PM' TheBoy or Omegatoy for details in the first instance.
Wow thanks for this. This all makes sense now as I owned a BMW 325 TDse a few years back with the same engine and it was super quick, although only when you got the revs up a little bit. This is something we need to do so I will contact these chaps thanks very much!
Engine oil/filter-changes must be done every 4500 miles absolute max; and water pumps have been known to shed their impellers at 40-50 quid a time. Other than this, the lump's a pretty strong 'un, and some have been taken to inter-galactic mileages - literally!
Aha, well this one is now due. It has full Vauxhall service history and they were using Shell Helix. Can any of you advise on the best oil to use (e.g. brand, viscosity, synth/mineral)? We dont want to be paying out £50-60 for a high end "branded" oil when often another make can be much cheaper and just as good. However if we need to spend more then we will.
Best driven 'like you stole it' - it's a 'long-stroker' and must be kept 'on song' to perform. As long as you have no poor starting, (either hot or cold), excessive exhaust emissions, or overheating problems, you should be okay. Once warmed-up, the temp gauge needle should settle at just below mid-point on the gauge. Many of the niggles with these diesels have been the result of inadequate and/or poor servicing earlier in their lives.
Yep, this is exactly how I used to drive my BMW as its only when you get the revs up that the power kicks in. No poor starting which is good; on my BMW I had a few problems starting which I believe is generally down to the diesel pump, although I seem to remember there is a diesel pump and a 2nd 'sender' pump or something. Temp gauge is spot on and good servicing history.
Thanks so much for this advice and you other chaps for your feedback.
I have something else to check as well. The EGR pipe from manifold to valve has been replaced twice by Vauxhall; once at 109k (mileage is now near 120k) in May2008, the other about 4 years before that. This has resulted in quite a bit of oil spillage although car is being valeted today to clean this off. Has anyone had the same problem and is this caused by something else...?
Big thank you again for your help and input. Think I'm going to buy an Omega again just so I still feel part of things!!!

8-)