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Yeah I don't have too much reliance on any temperature gauge fitted to a car from the factory, but this one seems particularly unrealistic! Short trips < 25km are in the minority for this car. The most common distance travelled is in the 25-50km range with a long distance trip (100-600km) every...

Great thanks, I'll give that a go.

Thanks for your response, very informative. What sort of magnitude are you talking about for shorter OCIs? e.g. the 10-12,000km I'm doing now, or something closer to half that? The thermostat appears to be working properly as the oil* temperature gauge on the dash warms up quickly and is rock...

Haha, I have a rally car for racing and a GT-R for fast road driving. But I also have a strong sense of mechanical sympathy for all my vehicles. The X5 doesn't get driven hard, it's the wrong type of car for that sort of thing. The most stress it's put under will be when towing a combined...

It's completely stock.

Hi everyone, this is my first UOA so any helpful advice is appreciated. The car in question is an X5 M50d with the N57D30S1 tri-turbo engine that has been ingesting diesel since the last oil change. That's getting fixed as soon as the timing tools arrive. It's the presence of diesel in the oil...