My 128i with 123k miles that I recently acquired shows 1 previous owner and regular maintenance history at the BMW service center.
I pulled the oil filter after some rough running with a CEL and noticed the filer was collapsed a bit so I installed a new Mann filter. I cut open the old filter and noticed a large amount of brown and black particles.
I did start the car and ran it for a few minutes with the new filter. No issues, CEL, or abnormal sounds/vibration. I pulled the new oil filter after that startup and noticed no similar particles.
I lowered the oil pan for a gasket replacement and looked inside the timing chain area and near the rear crank seal where I found a layer on the interior wall is peeling off. What are your thoughts on the layer of material? Oil varnish related?
What would you do? Part of me is saying remove what I can access with the oil pan and valve cover removed and then trust the oil filter to do its job. Then inspect the oil filter religiously for a while. Aside from a full teardown, are there known tricks to remove this or am I better off leaving things as-is?
I pulled the oil filter after some rough running with a CEL and noticed the filer was collapsed a bit so I installed a new Mann filter. I cut open the old filter and noticed a large amount of brown and black particles.
I did start the car and ran it for a few minutes with the new filter. No issues, CEL, or abnormal sounds/vibration. I pulled the new oil filter after that startup and noticed no similar particles.
I lowered the oil pan for a gasket replacement and looked inside the timing chain area and near the rear crank seal where I found a layer on the interior wall is peeling off. What are your thoughts on the layer of material? Oil varnish related?
What would you do? Part of me is saying remove what I can access with the oil pan and valve cover removed and then trust the oil filter to do its job. Then inspect the oil filter religiously for a while. Aside from a full teardown, are there known tricks to remove this or am I better off leaving things as-is?