another dead boxster @#$%!

[Steve Tinker]

Frodo - I've read on this board of new AOS units failing within a few hundred miles, so its one of those imponderables that can vary.
As with anything manufactured with plastic and "rubber" (nothing is rubber today), everything depends on exposure to max & min heat cycles, time, engine usage, acidic value of old oil attacking the plastic (as per IMS bearing seals), etc, etc, so I think your question cannot be answered easily.
Personally, if you check your oil cap vacuum weekly, look & listen for squeaking and smoking on startup and once a year inspect for excess oil and clean out the throttle body you won't go far wrong.
If there is no history of AOS replacement, THAT'S the time to replace it before it bites you on the a$$.

[Mark_T]

Right then, I'm sold. I'll start off next season with a new AOS and water pump.

Couple of AOS questions, though. I'm looking at the Pelican catalog and note 2 says that all models up to '99 engine 65X 01419 also use 996.107.145.06.M100 vent line and 999.707.446.40.M100 o-ring.

Is this the j-tube that I have see mentioned that should be replaced with the AOS?

My car is a 99, put in service Sept. 98. Is that info enough or do I need to find this number on the car somewhere to see if these are the right parts? If so, where?

Mark