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Thanks for sharing it HTHS tip! I will keep that in mind this time around. After owning7 BMW's Bought a Q5 this time. Let's see if the grass is greener :P Yes the the pieces in the oil sump were from the timing chain guide, no sign of belt material. It was a concern of mine so I did change the...

isn't running 10w 40 on an engine spec's for 0w30 to 5w-40 risky? Keep in mind I'm in canada, where we get -20c weather. most of the engine wear happens at start up under operating temps.

I already changed the sensor and chekced the oil pressure with a guage, oil pressure it up to spec until the engine is off. oil pan didnt have much metals, with the exception of 1 plastic timing chain guide.

UPDATE: I want to start by thanking this community and everyone who shared their ideas and knowledge with me. Many suggested I scrap, sell, or change the car's engine. However, I was keen on gaining firsthand experience in dealing with sludge issues, fully aware that I might eventually need to...

I think your right, im over thinking this. Bought the oil pressure tester but I just found a bmw service manual on the n55 engine. Looks like the oil pressure is actually normal! As for oil consumption, before I pulled the bottom end off I did drive it for about 6000km and it was about 1 quart...

That's a great suggestion. The bottom end has a lot of darkened varnish. But not a lot of sludge. I did blow air through all the oil passages from the bottom to check for blockages. But the one big issue are those tiny oil squirter on the back end off the piston. It's like a pin hole at the tip...

I didn't measure the crank bearing clearance but I did check for radial play. Really dont want to drop the subframe again xD. I did that entire job on my driveway.. not fun. As for the oil pump I opened it up and checked for signs of wear, A bit of scoring but no deep scratches. Spun it a few...

Mobil 1 0w40

I did clean up the top end as much as I could with diesel. Vacuumed and then blew out anything loose. And flushed out everything before putting the new oil pickup tube and bearings

So I bought a BMW 535 and everything seemed good until I opened the valve cover. I was experiencing lower than average oil pressure. I'm getting about 24 to 26 at idle. Just bearly within spec. Buy most people are getting around 35 psi at idle. I dropped the oil pan. Replaced the plastic oil...