306oc - Peugeot 306 Owners Club & Forum

What is the expected oil pressure for an xud? Fitted an oil cooler and Mines gone up I have a 100psi gauge and now isles warm at 50 and off the gauge when driving. Where without cooler was 20psi idle and 70/80 driving

XUD9 engines should have a 5 bar pressure relief spring, so you shouldn't really be seeing more than that with hot oil. 5 bar is approximately 72psi, so that tallies up with the 70-80 figure that you were seeing before.

If it's gone up that dramatically since fitting the oil cooler and the reading is accurate, then I'd hazard a guess that the oil cooler must have a massive restriction somewhere.

Obviously lower oil temperature will mean thicker oil and more pressure, but I'd be surprised if you've had such a dramatic change in temperature that the pressure figures have changed that much. Big clue will be if the figures are also dramatically higher a few miles into a journey when the oil won't be fully upto temperature.

that is odd. As said there is a 5bar limiter basically.

Mine is 5 bar cold at idle.

Once warm about 2bar, climbs with rpm to no higher than about 4.5bar flat out

It stays same once warm even after 25 30 mins when I get to work Thats with oil temp at 80-85.,its only a small 9 row cooler

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Where is the relief spring?

Relief spring is part of the oil pump, sandwiched between the main body of the oil pump and the pickup casting.

Argh so not something easily checked then, Will try get another cooler to try its a second hand cooler so might as simply as a blockage in there