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[Muroman]

Hello,

3.0 litre Omega has developed this metallic rattling noice above 5000rpms. Oil changed at every 5 000-10 000km or after one year. 262 000km driven. Head gaskets changed at 220 000km and the heads were cleaned but not lifters. Lifters doesn't rattle even when started from -20degrees. Gearbox is fine and she has all the power she ever got.

Lifters or bearings or something else?

In two months it has been 4 years since last cambelt change, and at the moment 42 000 km with that belt, so there is a service coming anyway.

[MonzaGSE]

Loose/rusted heatshield somewhere?

[johnnydog]

It is very difficult to diagnose particular a engine noise, as everyone's perception and description of a 'rattle' is different. I would try to get a trustworthy third party to pinpoint the area of the noise ie whether it is the top off the engine, bottom end or a vibration / resonance, or just from an ancillary component. The description you gave doesn't help really without actually hearing it.

[Muroman]

I have always been very careful with revving engine before fully warmed up, it seems now that even when the thermostat opens it isn't warm enough.

I suspect that the lifters are making the noise just before engine warming up properly. After long highway run there isn't any noise.

[henryd]

I think I would be tempted to drop the sump and clean the oil pick up strainer just to make sure its not oil starvation