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2022 Crosstrek Limited
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Discussion Starter · #1 ·
Needed to pull the Crawford Baja AOS off for pending dealer visit. Found it heavier than when installed. Only 2500 miles with it on 2.5 liter Crosstrek.
Poured a 1/4 oz of thin Wood Button Circle Metal Fashion accessory
reddish looking oil from AOS. No water. Must be heavily baffled, had to rotate and twist to extract a little more several times. Flushed unit from top port with brake cleaner and then from lower port. Discolored brake cleaner is all that came out.
Engine has not used any measurable oil in 4100 miles since last oil change. Will be on 6000 OCI for next three. Plan on catching the oil to monitor color and viscosity. Plus volume.
 

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Discussion Starter · #3 ·
You are correct, it is designed to be maintenance free. Does not come apart to drain.
I am pulling it before dealer oil changes. Do not want to chance any hassles about warranty. Took 25 minutes to remove and reinstall the original pipe. I have the intake down to a couple minutes on or off.
Glad to see it is catching oil. That little bit in the cup may not be all it filtered out. Both hoses had almost no oil film, so not much oil traveled through in 2500 highway miles.
 

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Discussion Starter · #5 ·
My limited understanding oil is pulled back into crankcase when the air in crankcase cools. The volumes are very low. And the process happens every time the engine cools down. Not like a catch can where the liquid is caught and dumped periodically.
Catch cans act as a trap with inlet and outlet at the top of the can. Liquids drop out. The liquid is usually 90% water. And at 2500 miles normally a couple ounces of fluid with a thick oil film on top.
Checked the dark fluid in AOS and it was oil. Nothing separates out. Assume the AOS is hotter and the water boils off. I put 900 miles on car Wednesday. It stayed hot under the hood for more than 15 hours. Might explain why catch cans catch mostly water and this time the AOS had all oil.
 

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Discussion Starter · #7 ·
Yes, car seldom revs to 3,000 rpm. Purchased car for long highway trips.
In the long drive from Houston to Nashville the highest I saw was around 2300 rpm. That was climbing a grade at 75 mph. Around here it is 1800 rpm at 75.
The CVT works as promised. Reduces oil slinging.
 
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