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[dbdb]

I definitely agree about using fully syn but I am wary of GM dexos 2 which is ACEA C3 spec .  The oil manufacturers pointedly pass responsibility back to the car makers, saying 'GM say the C3 spec is backwards compatible with A3'.  It is or it isn't, why not state it yourself?  In fact ACEA say differently "Warning: these oils have the lowest SAPS limits and are unsuitable for use in some engines. " I believe C3 is aimed at diesel exhaust particulate filters and very modern cats.  Quite a few fully syn oils, usually the most expensive ones  are C3.

From http://www.omegaowners.com/forum/index.php?topic=113301.msg1429257#msg1429257

I'd be interested to see a photo of the oil pick up or does someone have one of a blocked pick up already?

[Kevin Wood]

Fully synthetic oils are intended to cope with extreme temperatures. I know many in oof don't see the point but I am convinced that it is worth paying a little bit more for GM 5w30 synthetic oil (dexron ?) .

Yep, seeing the state that Semi Syn gets into in these engines (and my Westfield, where you can see it breaking down in terms of reduced oil pressure) prompted me to go fully syn.

Also, remember that the 20K service interval was conditional on the use of A3 oils whereas I wouldn't be surprised if most main dealers just get their bulk tank filled up with the cheapest cr@p they can get hold of and the customer carries on blissfully unaware that their oil is being used 15k beyond the end of its' useful life.

[tunnie]

The sump was dropped on my 140k 3.2 Elite, we found some shards of crap on the strainer. Talking tiny amounts though, think poor maintenance followed by good maintenance can cause this ? 

[mantahatch]

It happens to the 2.5 as well. First Omega we bought for mum was a 99 2.5 with seized bottom end. Think it is just down to poor oil maintenance myself.

We replaced engine and all was well for many years.

[TheBoy]

At 207k, and 120k of that as me as an owner, I couldn't complain if my big ends let go tomorrow. Obviously I'd be gutted, but couldn't complain.

I think the GM service intervals are the biggest problem.

[chrisgixer]

20k oil change intervals and a 90c running temp seem excessive to me. Being honest.

[Webby the Bear]

guys can I just clarify whats been said.....

most omegas are probably going to have worn big end bearings irrespective of oil changes.... how come most of them do lots of miles then?

sorry just trying to understand 

[VXL V6]

20k oil change intervals and a 90c running temp seem excessive to me. Being honest.

Think the running coolant temp might be a bit higher than that - usually dashboard temp gauges read a little lower on the scale inaccurate scale in order not to worry the average driver!

[2woody]

certainly Omegas have a disproportionately high incidence of big-end failure.

I've done maybe eight Omega engine rebuilds now, every one prompted by big-end failure, rather than anything else

[biggriffin]

certainly Omegas have a disproportionately high incidence of big-end failure.

I've done maybe eight Omega engine rebuilds now, every one prompted by big-end failure, rather than anything else

Probably those that arnt well looked after, lots of OOF'ers have good milage,and no failures

[cem_devecioglu]

   scary thread.. enough to fill in my pants
 
full synthetic from now on..

[omega3000]

scary thread.. enough to fill in my pants
 
full synthetic from now on..

 

Im going to take that Poundland oil back now 

[TheBoy]

Well, I rolled over 208k today. It did it in style, and at speed.

[05omegav6]

Howz the roof now

Sounds like someone will get ear ache about the fuel consumption

[TheBoy]

Howz the roof now

Sounds like someone will get ear ache about the fuel consumption

I got earache at the time. Which I always find encouragement to try harder