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Old 07-10-2019, 04:28 AM   #1
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engine air-oil separator (AOS) replacement cost?

I just had my 1999 boxster base in for a repair at a local (Porsche specialist) shop and the mechanic told me I need to replace my engine air-oil separator. I have no leaks on the garage floor and Iíve only seen a puff of smoke a few times at start up. No check engine light and it idles and runs smoothly. 39k miles, Iíve had it for about two months now. He said $1000 to do the work. That seemed high since the part is about $100. I called another shop ( about an hour away) and they said about $400 for the repair. Are there hidden costs or is the local shop just trying to rip me off since I have a 20 year old car? I think I will drive the hour and save $600.

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Old 07-10-2019, 05:01 AM   #2
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I've replaced a couple. There's a rubber hose on the bottom that can be difficult to clamp in place, but it's not '$1,000 difficult'. The only other factor I can think of is that some of the more rigid plastic hoses that attach to it may be brittle and need replacement too. That may justify the $400, but not $1,000.

Here's the article on how to do it yourself: https://www.pelicanparts.com/techarticles/Boxster_Tech/09-ENGINE-Air_Oil_Separator/09-ENGINE-Air_Oil_Separator.htm
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Old 07-10-2019, 05:01 AM   #3
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I think you answered your own question.
How did the shop determine the AOS was bad?
Yes the part is relatively cheap but is a PITA to remove/install. Make sure they replace the (2) flex hoses, especially the one that connects to the Throttle body.
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Old 07-10-2019, 05:49 AM   #4
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$1k is robbery if they are not replacing the under intake hoses.

i've gotten this down to a 1 hour or less procedure. Almost all the work is done under the car with the passenger rear wheel off.

Any experienced shop should be able to complete this in 1 hour of shop time, assuming there are no other issues preventing a smooth R&R.

Changing the under intake hose is a royal ass pain, but its still should not be a $1k job.
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Old 07-10-2019, 06:16 AM   #5
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Maybe they have a $1 swear jar. In that case, $600 seems about right.
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Old 07-10-2019, 06:55 AM   #6
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I agree, watching a YouTube video makes it look like I could possibly do it myself. Not sure if I want to start something I might not be able to finish and then have to take it back to this local shop. I think I will take it to the shop that is an hour away, have them do a scheduled oil change and have them evaluate the car. I just started it and there was no smoke at all. The oil filler cap has vacuum but not so much I canít remove it. The engine does drop in rpms when I take the cap off. All seems pretty normal to me. The local shopís labor rate is $95 an hour. That would mean about a 8 hour job. Or just maybe this is his way of saying we donít want to work on your old car.
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Old 07-10-2019, 10:16 AM   #7
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Mine went out the day I started driving it, literally within 3 miles

I watched all the online videos and was able to change it myself relatively easily with just a jack and axle stand, not going to lie it wasnt exactly enjoyable but very very do-able yourself. As they say online the best advise is to get yourself a few band clamps from home depot to replace the factory clamps, this will make installation a breeze
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Old 07-10-2019, 02:57 PM   #8
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$1000 is from a shop that already has more work than they need.

$400 is about right. $100 parts + 2 hours of labor. Yes, a shop should be able to do it in less that that but they will almost always charge the book hours unless you're a regular customer.

I've done it myself and it is a royal PITA due to limited access but it can be done in a couple of hours. Just know ahead of time that you're going to cuss a lot so pick a day when the kids aren't around.
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Old 07-10-2019, 08:23 PM   #9
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Wow, older Boxsters must be a PITA to replace the AOS. I can change out my 2003 Boxster S AOS in 30 min easily.
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Old 07-11-2019, 04:13 AM   #10
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Originally Posted by KRAM36 View Post
Wow, older Boxsters must be a PITA to replace the AOS. I can change out my 2003 Boxster S AOS in 30 min easily.
My second time I believe I could do it in less than an hour. It's the coolant tank I'm not looking forward to when the time comes. 98 here.
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Old 07-11-2019, 04:26 AM   #11
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Is there a difference between the 2.5 and the 2.7 as far as the A.O.S. Goes?
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Old 07-11-2019, 05:45 AM   #12
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Reason why I wrench my own cars.
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Old 07-11-2019, 07:06 AM   #13
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Quote:
Originally Posted by KRAM36 View Post
Wow, older Boxsters must be a PITA to replace the AOS. I can change out my 2003 Boxster S AOS in 30 min easily.
Yes, they changed the aos on the 2003 cars. Much better access!

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