Oil pressure and temp

[powerandtorque]

5 bar is a LOT of pressure imho

Not really it's not - indeed, I think that the lowest rated pressure relief spring on an XU/XUD series engine.

Maybe 5 bar is the upgrade then, hmmm. I think it's best we ignore everything i've just said, my memory seems to be temporarily unavailable lol.

Ahah, google comes through again: http://www.pugaddicts.co.uk/2012/12/peug...-data.html

3.8bar and 80 degrees seems to be the standard.

Just double checked Servicebox and XUD11's have a 6 bar relief spring as standard, same as XU10 engines.

XUD9 and DW10's (HDi) 's have a 5 bar spring which is where you were likely getting that from - same as XU5/7/9 8v engines.

I've not checked the gearing for the oil pump, but you should really be seeing those sorts of pressure figures high up the rev range with warm oil - certainly the figures that Piggy's mentioning sound very low if they're peak.

Oil pressure is indirectly a function of flow, which in turn is a function of engine speed, and therefore you'll see lower pressure at low revs and it will climb as the revs increase.

To give some rough figures of what I see on the GTi-6 engine in my 205 (which has an oil pressure guage as standard), it's in the region of about 1-2 bar at idle and 5-6 bar at 4000rpm with hot oil, and with cold oil it'll be around 3-4 bar at idle and it'll pin the pressure gauge at maximum (8 bar) at 4000rpm

These are pretty normal for XU petrol engines in my experience, if usually a little lower for the older 8v engines as they have a lower geared oil pump drive and lower (5 bar) pressure spring on them. Drastically lower figures, if confirmed by a "proper" oil pressure gauge and even after an oil change, tend to point at a tired bottom end. I would be surprised if XUD/DW figures were much different.

Oil temperature is a function of how hard you're driving and what oil cooler / heat exchanger you have fitted - something around 80-90 degrees on the motorway cruising at 70-80mph would be in the right ballpark.