Oil Change - Car not happy when hot

[rb0135]

Hi All,

X5, 3.0d

I changed my oil about 6-8 weeks ago, and I am finding that the car seems to lack power when the oil/engine is at normal running temperature. It is perfect when the oil/engine is cold/warming up.

This is probably a stupid idea, but could the the oil "hinder" the turbo in some way, does this sound feasible.

Someone has suggested to look at the Oil Breather/Seperator filter as they had a similar issue. Once they change the Oil Breather filter, they had the power back when the engine was at normal operating temperature.

I used Castrol Edge Sport 0W40 oil, which was the recommended oil in the book at the Car shop where I got the oil. I also changed the oil filter with a genuine BMW filter.

I have bought a new complete oil seperator unit (the cars done 90000km) just for piece of mind, and was told it is a 10 minute job.. Well, looks like 10 minute job when you spend 50 minutes pulling the plastic housings off everything to get to it.

Anyway, could this oil be too thick when engine is hot/running temperature. The temps in Sydney, usually dont go below 10C and averages high 20C in summer (with some hot days of course and we are going into the Summer Season now).

Should I be using 5W30 instead?

I have checked for codes and there are none registered.

Sorry, for the questions on oil, but this is a specific issue that occured after the Oil Change.

Thanks all,
Rob