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It's 111 EVO engine.
If u see this picture under the hood (oil stains) and mileage more than 60.000 mi - u need to replace oil separator and O-ring on oil cover.
All parts that u need:

A1110940283 - oil separator
A1110182682
A1110182882 - hoses
A1110183282
A1110180080 - O-ring
You will need the following tools:

Specific tool there is only one - Torx E10.
Remove airfilter cover and unscrew 2 torx on separator:

loosen the screw:

Detach all hoses from separator: (at this pic we see why you need to change the hose - it's already not a rubber, and it breaks)

Detach oil separator with butterfly valve:

Detach butterfly valve and O-ring (!) - it should be moved to a new separator.

Install all parts in reverse order. Use silicone spray for rubber parts, it helps to attach tubes to the separator.
Replace O-ring on oil cover.
 

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Hi! great info on here. I need to get my oil separator as well as my MAF sensor replaced on my 03' r170. I'm curious, how much did you pay for the oil separator parts?
 

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Hi! great info on here. I need to get my oil separator as well as my MAF sensor replaced on my 03' r170. I'm curious, how much did you pay for the oil separator parts?
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You don't need to buy a new oil separator, just remove it and clean it with cleaner or detergent that will not melt plastic.

Also, the elbow connected to the valve cover comes off with the unit. Do not try to pry it off by itself; it will break. Carefully remove it with the entire oil separator.
 
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