Motorsport AOS

Apologies in advance if this topic already exists, I could not find it. Has anyone had any success installing the Porsche Motorsport AOS SKU: 996-107-926-00 in a 996.2 Carrera 3.6 engine? Were any customizations needed? I bought the part from LN Engineering together with the extra parts they suggest, thinking it would be easier to get the Porsche OEM part installed as opposed to the UAOS and now the car is in my shop for more than a month because my mechanic can't get it installed, it sounds like the return does not match the top of the engine. I don't think LN will take the part back but they won't tell me what it takes to get it installed either so my only alternative seems to be getting the car towed to a shop that can fabricate a return pipe that will match the top of the engine. Based on my research post event, it is looking like that part is compatible with the gen1 3.4 996 Carrera engines but not the 3.6, which I wish I was told before I purchased the part. Thank you! Daniel

Hate to say it - but the UAOS is simple to install, versus the motorsport AOS, due to the UAOS being built for the M96 and being plug and play. The motorsport AOS requires custom installation and hoses (as I have researched before). -Tom 2003 C2 with UAOS and UIDS

Yeah, I loved the Motorsports AOS in relation to the OEM AOS. It was the only available solution at the time. Then the UAOS was developed with a membrane that was 2x the thickness of the OEM AOS and MS AOS making it more durable, with the location as such that in 5 min you could replace versus taking hours to replace the OEM AOS and MS AOS. Then the UAOS Track version was developed which had all of the advantages listed above, plus a sump drain back that allowed you to not only run and process the oil from a 2qt deep sump during high G turns, but it can also process an additional 1-2 qts of oil on top of the extra 2qts of oil in the deep sump. That's a total of 3-4 quarts of additional oil to help mitigate the oil starvation & oil pressure instability issues as well as catastrophic hydralock. WOW! Skip suggests a blow-by test to determine whether you can run 1qt or 2 qts more with the UAOS T. Not to mention the design and location of the UAOS allows you to eliminate the coolant lines that run thru the OEM and MS AOS, which in essence eliminates the risk of intermix from the AOS. After 2 OEM AOS failures back to back on the track in the mid 2000s, i gladly went to the MS AOS from 2006 thru 2022 since it was the only available solution. After studying the UAOS Track for two years, i went to the UAOS Track version in 2022. Just a smarter all around product that is the swiss army knife of solutions. Solves for alot of issues all at once.

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Hi Daniel, We just removed our UAOS setup and installed a factory motorsport unit in our 3.6. We are very happy with the results and it's Posche. Skip makes a great product and I have it in my 3.4 but wanted to go all Porsche with my 3.6. I'll get a list of parts needed. Actually a better idea, have your mechanic reach out to me. I'll get him in touch with my mechanic. We just literally did this a few days ago. It took about 3 days for all the parts to arrive from Porsche. Send me a pm.

Since I am a Retired Porsche Gold Miester Technician and have much respect for Porsche Engineering , I hate to "beat up" on one of their designs, but since this is a Technical forum, I feel I must give some Technical facts...The MS AOS was their first attempt to correct some inherent design issues with M96 and oil ingestion on severe corners , by holding more oil in the MS AOS body...This does keep oil from the intake but also lowers the usable oil level in the sump...so is not the best solution in my opinion....By keeping more oil in the MS AOS body, it is increasing the risk of oil starvation... The better solution is keep more oil from going into the AOS system to begin with,by being more efficient and to drain the oil back to the Sump twice as fast to keep from lowering the usable oil level in the Sump...The UAOS does this , along with the diaphragm being twice as thick to be more robust and also in a convenient location for easy access ( Patented) I can certainly see why someone would "trust" OEM Porsche Engineering over a "retired Porsche Tech", but the Quantum Laws of Mechanics doesn't care WHO the designer is...

We had some other issues with our car not related to your UAOS system and when we put it back together we just went the other direction. It was just the case of what the new mechanic wanted to install. Both are proven systems. One takes longer to install but I don't think throws a flashing oil temp light which is what my white car does. I think you have a solution for that though? Neither system is perfect or without their own issues.

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Yes, I have solved the intermittent "false slow flash warning"... When I first designed the UAOS I wanted a warning system that could warn of a risk of oil ingestion. The stock AOS has been responsible for many many early engine deaths from cracked cylinders and bent rods and hydro-locked engines. Many of which were not diagnosed due oil being "everywhere" as expected when there is a catastrophic failure..and the AOS was never suspected or confirmed to be the root cause...Just another engine was sourced.. The Sensor I chose for the UAOS is made by SST Sensing in the UK. It is a Laboratory/Medical Grade Sensor . It is very high quality and robust, but is also very sensitive, so sensitive that it can pick up liquid vapors and cause a "false warning slow flash"...Coating the sensor tip with a ceramic wax and indexing it to a specific orientation will lessen the sensitivity, but SST worked with me to design a Sensor ( it has a different algorithm in the Micro-processor) just for the UAOS application that is perfect...The original sensors are not failing, they are just too sensitive and the updated ones are perfect.. The MS AOS is just like the stock AOS except it has a larger body that holds more oil...It has the same Vortex design and the exact same diaphram.....The only reason it costs 8x more is the low volume...The only functional difference between the stock AOS and the MS AOS is that the MS AOS holds more oil in the body......If you are ok with that then..... The UAOS is a completely redesigned System with custom fitted parts that some just "Look" like the factory parts but they function in an entirely different and more efficient way, and it out performs the MS AOS and stock one by a very wide margin...

Luckily I have the UAOS setup in my autocross / skid pad 3.4 and the Double Can AOS setup in my track 3.6 Maybe I'm the only one in the country with this setup? I'll put them both to good use and report back. Hopefully I have good luck with both cars and both systems just as GC996 has had.

Thank you so much! I DM'd you asking for your number so my mechanic can reach out.

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lol...You're certainly not the only one with that set-up, but I just got off the phone with EuroSport and they called me looking for more dependability for the M96 on the track, and am telling them all the things I have said in this forum... Yes Glenn has been fortunate, but he pays very close attention and does everything he can and uses the best he can buy, and changes his oil every time and keeps the temps down., and sessions short....Every little thing counts because there are more little things that can kill the engine than there are little things that will save it.. Some Mechanics are like cooks who find a recipe that tastes good, they stick with it, Others are like Chiefs who search for the best possible/freshest ingredients , then may even try a few extra spices to the recipe for an exceptional flavor..

Something to think about... These engines need more oil to control oil starvation and oil pressure instability on the track. So the following questions need to be asked. 1. How much more oil do you need? 2. What bolt on parts give you more oil and how much do they give you? 3. What combination of bolt on parts are most effective and efficient at delivering the oil to address oil starvation and stability while potentially solving for other issues such as intermix and hydralock. When new solutions come out, it's important to rethink these 3 questions and tally up the results. It takes alot of argument and time for various shops and folks to recognize the results. But eventually they get there. I don't fault any shop for choosing a path that was the only path for decades. But at the end of the day, its tough to stand in the way of innovation.

Fo sure. And Porsche AOS is not the path of least resistance either. It requires more work. Most don't want to go there either.

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So many factors in play including oil viscosity. Why are some still running 40 weight when 50 weight clearly has pressure advantages?

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Because it's "Porsche Approved"...

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It's an evolution. Same with solutions.

The previous owners of my car (that I bought last year with 39K miles) took very good care of the car and did a an incredible amount of mechanical work for which I have most of the documentation, but some (new plugs and coil packs, IMS bearing) I don't have any record of. My question: Is there a way I can determine if the AOS system has been replaced by visually looking at some portion of the components? I know the AOS is currently operating correctly by the vacuum measurements, but I'm wondering if the diaphragm is somewhat of a ticking time bomb.

Dont know if the part number has manufacturing dates assigned. But the diaphram could last a couple of decades or go at any time once it's had enough. Two easy ways to know that it's starting to fail other than performing a vacuum test is (1) if it's tough to get the oil cap off from suction when the engine is running, and (2) puffs of exhaust smoke at startup as well as during aggressive cornering. If you track the car and it fails, you will see plumes of smoke and you better get off the gas and track asap or you run the risk of hydralock. Not to mention the oily smoke isnt good for the longevity and effectiveness of expensive catalytic converters, nor oil consumption and the appearance of cels. From a street perspective, you may also experience some exhaust smoke If you overfill the oil or park on a hill. But that doesn't mean your AOS is failing. It just means your AOS can't handle the extra oil or hill which is a known problem with the oem aos. Hence why Porsche recommended running 0.5 qt less oil under full to conteract the oem AOS shortcomings. No need to loose any sleep. Its a pretty easy issue to fix with the proper replacement parts. Same with replacing your water pump every 5-7 years and running a good IMSB. All pretty easy to do and bullet proof the engine.