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[Entwood]

many thanks for all the comments, methinks I'll forgo the possible risks of leaks and stick with 10W40 .. 

[johnnydog]

My understanding is that one benefit of 5/30 oils (fully synthetic) is for the extended / variable service intervals that many manufacturers quote i.e. VW and Audi for example, 20k or 2 years.
Depending on an annual mileage of say 10k, a yearly oil change with GM's 10/40 semi synthetic is sufficient for an Omega. For the cost of an oil and filter, twice a year, or if harder use or higher mileage, isn't unreasonable in my opinion.

[Keith ABS]

If anyone is interested, Autovaux doing special on both 10/40&5/30 until tonight

Keith ABS

[Kevin Wood]

Mine has been run on 5w30 since I bought it at 40k. No issues and no leaks. It's actually the specified oil for the 3.2, of course. I wouldn't be passing on that one!

[baggers]

You know what they say "long life oil, short life engine".  Anyone who knows what goes on in an engine wouldn't leave oil in for these crazy long service intervals.

[Entwood]

Mine has been run on 5w30 since I bought it at 40k. No issues and no leaks. It's actually the specified oil for the 3.2, of course. I wouldn't be passing on that one!

OK .. this has convinced me ..   When the present stock of 10W40 runs out I'll use the gizit 5W30 ... Never look a gift horse ......   

[johnnydog]

Mine has been run on 5w30 since I bought it at 40k. No issues and no leaks. It's actually the specified oil for the 3.2, of course. I wouldn't be passing on that one!

Where is this actually specified? My owners handbook states both SAE 5/30 and 10/40 are suitable for the 3.2.
One benefit of 5/30 is that it is suitable for cold start temperatures down to -25 degrees C, as opposed to -20 degrees C for the 10/40. I don't think I need to worry about that in the UK. I'll stick with the 10/40's......

[baggers]

I have just had a look at a couple of sites that make oil recommendations for different vehicles one of which is often mentioned on here, none of them have 5W30 as a recommended oil for the 3.2.

It may listed in the handbook, but for what country climate?

[omega2018]

My 2.6 V6 has been on 5/40 fully syn for the last 30k miles and 7 changes, seems fine.

incidentally I have recently lagged the oil filler pipe, this seems to have stopped the slight mayo i used to get. lid still unlagged so moisture could condense there if it wanted to, but doesn't. 

[Kevin Wood]

When the service intervals were extended to 20k for the Omega petrol models, this was made conditional on the use of the GM Dexos2 5w30 oils, so this is what would have been used at a main dealer.

Of course, you'd be mad to leave it that long, although it lasts much better than the semi synth 10W40, and the difference in actual viscosity with a 10W40 oil at normal working temperature is pretty minimal, so both will work just fine. 

[peter the butcher]

so I am a bit ignorant of the oil debate. I  changed oil/filter last week, or rather raywilb did. And went to the vauxhall main dealership here, and bought oil from them, and was given 10/40, so I presumed it what they say is recommended

Peter