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[2woody]

Anything "hypoid" or with two friction ratings on it will poison the diff plates ( permanent ) and should not be used.

you need the correct Vx oil ( try AndyC ), which is I believe a straight 90-weight oil.

add the friction modifier first.

[Zippy2012]

Alright Chris, ive bought 2ltrs of Carlube EP75 W90 Hypoid gear oil fully synthetic (spec API GL-4,GL5 ,ZF TE MLO5A) & States on back including limited slip diffs so hopefully it be ok... 
According to the spec sheet it has an lsd & once jacked up both spin if i spin 1 wheel,
unlike my cdx which 1 went clock 1 anti clock so defo has one,
Car drives fine but odd shudder & thudding like 2 flat tyres from a standing start in 1st reverse & sometimes into 2nd gear... but not all the time intermitant... car drifts lovely spinning both wheels but now & again only spins inside tyre closest to bend... maybe once oil changed it will sort it i hope... Hopefully meet up in the future somewhere...

cannot comment on the Carlube stuff, sounds like normal gear oil to me, reckon your still need an LSD addertive, still reckon an oil change is in order (220K)?

As for the shuddering, thinking out loud now, starting to think axle oscillation when the LSD kicks in, hows the rear suspension set up, worn or loose, or furbed bushes at the rear?, probably wont happen at higher speeds and high speed gear changes.

looking under the rear the 2 bushes at rear of diff that hold it to the chassis look like originals & may have possably split?? with a pry bar all seem ok under what i would call normal mot play to pass.... Just odd how when the car is cold nothing drives fine nut when hot plays up & thudds...

Does any body know where... or have any of the genuine diff oil & how much.... Vauxhall quoted me £12+ per bottle & they have to order minimum of 12 bottles & i gota pay for all of them £120+vat i told guy to break off....

[2woody]

was that AndyC ?

[Marks DTM Calib]

I always used BOA90LS in mine from opie oils.

Worked very well.

[2woody]

yep - that's a "straigh-90" 

[Zippy2012]

was that AndyC ?

Na was local Bicknells useless Vauxhall dealers & when i asked him for the  correct spec oil (as i was given the gm part number from someone else a while ago) He took ages & when i asked how much i needed he didnt know...
then all he said was...
like a jumped up little 16year old kid....
that part numbers now changed mate its....(watever it was)
but its not in stock.... special order to get it.... minimum of 12 bottles.... about £10/£12 per ltr plus vat was £120ish plus vat!... break OFF!!
Can andyC get the genuine gm stuff or have any in stock?? at end of month im going to try sort out a trade discount card but how do i do that???

[RobG]

Use this http://www.opieoils.co.uk/images/VARIANT/large/993.jpg
From here http://www.omegaowners.com/forum/index.php?topic=47512.0

[2woody]

AndyC is a parts man at a main agent

[Marks DTM Calib]

From Vx you have to buy the standard diff oil plus a seperate friction modifier.

From memory you need a small bottle of the modifier per 250mm and hence four needed.

And also hence why I went down the BOA90LS route!