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Hello,

I recently acquired my mothers S60 which currently has 139k and is presenting the following issues:

Oil consumption - I can't really say how much oil the car burns but it always has been said to use about a qt a week or so. It also blows white smoke out the back

Check engine light - P0171 system running lean

PCV Whistling - Stops when you remove the oil cap and/or oil dipstick

Oil cap - Has white substance on the inside of the cap almost like the cars got a blown headgasket. (The coolant is not low)

When Checking the oil - If I take the dipstick out when the engine is running the oil on that dipstick will just get sucked right back in (I suspect this is the case because when I check the oil while the cars running the dipstick comes out clean, but if I check it while the engine is turned off (and still hot) I will get a much more accurate reading)

Oil filter assembly - There is some suspicious grease substance going on on top of it. Looked up a picture of the oil filter assembly and found that the piece im looking at sits RIGHT BELOW the PCV assembly.

This car has always had oil consumption issues since I'd say around 100k but the PCV whistling and engine light just happened TODAY. However, my primary concern, is that the piston rings are defective and that the oil consumption issue is caused primarily by that, and the PCV failure is a result of this? I am not super experienced with Volvos but my local specialist diagnosed the oil consumption initially as the piston rings probably being defective. I am aware that this is extremely common on 2012 and 2013 volvo modular engines.

I have not observed any oil seepage coming out of the timing belt area

My main question... is my oil consumption caused by defective piston rings or Bad PCV assembly? Any input is appreciated. Thanks again
 

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Also, make sure the timing belt has been changed and check serpentine belt and pully and tensioner for wear. If that if either of those belts have not been attended to you'll have a timing belt failure which will ruin the engine and make all the other issues moot.
 
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