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[jonathanh]

all i can add is that Kayaba seem to be the "standard" replacement here and reasonably priced as well

[Peter13]

How do I always have such a bad luck???
I bought a pair of original KYB RX5416 coils in box. Brought them with the car to my mechanic this morning and came to the office. The guy has just phoned me: one is in, but the other is for a sedan!! WTF?!?!?!?!?
Of course there is no chance to get replacement today all over the city.

[Peter13]

Update:
New KYBs in. Issue is the same. It has the list to the left, and is hard to keep the car on the road while driving.
No idea what to do

[tunnie]

Shocks the same on the back? Do you have self levelling (I know MV6 does not here, but over there MV6 is often near Elite spec)

[Peter13]

It was just built to normal as the self levelling system has gone. However the rear shocks are cheapo aftermarket ones from german ebay, but same type and brand new. Next I am going to check the surfaces where the spring stands upper and also the bottom of it.

New idea: might caused by the front!
Is it true that the V6s have different front springs  on the left and right? Mine from the breaker looked the same. If yes, could 1-2cm difference at the front cause 3-4cm at the back diagonally? (i.e. front right is 2cm taller that is why the rear left is deppened by 4cm ?)

Thanks a lot guys.

[kcl]

no difference whatsoever in front springs on left and right 

[Peter13]

I've found the opposite information on german omega forums. They say on V6 models the driving side spring coil (left here) has to be 10mm taller. This is exactly the situation with my old springs that came out. Even the GM numbers are different. 
I think you can use the same on either side because you are driving on the left and the car is well balanced with the steering and the driver on the rigth.

[kcl]

I've found the opposite information on german omega forums. They say on V6 models the driving side spring coil (left here) has to be 10mm taller. This is exactly the situation with my old springs that came out. Even the GM numbers are different. 
I think you can use the same on either side because you are driving on the left and the car is well balanced with the steering and the driver on the rigth.

First time I ever hear about this  But as usual, I may very well be wrong. Still would be very, very peculiar in my opinion to have different lengths of front springs on ANY car. So, I will keep my opinion until I get an explanation why 

[Peter13]

Gents,

herer comes the solution!
I took the car to a smith who makes new springs on demand or renews, cut, enlength used ones. He asked the first sight if I put the same type on both sides and told I should not have done this, because in right driving countries V6s have to have longer and harder spring on the left. At the end he found that my car had different springs, but they were swapped. Theen took them out, added 2cm to each, put back to the right side and that's it!! It stands now like it had the bad road package

[HockeyDave55]

Ok, I hate to throw a spanner, or in this case a spring compressor into the works but, Can anyone actually confirm this? I changed the springs on my Omega without any instruction to say the springs are different left to right and, of course I just threw them on... I know it's 50/50 to get it right first time but I would expect instruction on it???
Iirc, I'm sure I checked them out and I think I would see 10mm....

[Peter13]

Afaik in the UK you should have the identical springs on L/F. I assume only we use taller on the left because we have the driver on the left(and are driving on the right side of the road of course.) If you have a police edition, there could be some difference, check it out in EPC or http://opeloem.com/vauxhall/omega_1994_2003/front_axle_and_suspension/front_springs/20se_x20se_x20xev_engines_for_police_vehicle__x1999999.html