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Which ATF Fluid?

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Old 01-03-2013, 06:28 AM   #31
sjfehr
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A 2002 at 45k, I'll do it this summer. Does anyone have the filter change procedure? I'll look for an easy place to do a complete flush when I get in there. MaxLife it will be.

The ATF is an important choice, unlike mundane fluid choices such as coolant or washer fluid.
There's a really good how-to at Pelican Parts.
http://www.pelicanparts.com/techarti...uid_Change.htm

It meshes perfectly with the Boxster service manual leaked online and is more detailed than the procedure in the Bentley guide. You need to remove the steel bracing from beneath the transmission, and then a half million pan screws; the filter itself is held on by 2 screws and trivial to change. You'll need a 17mm driver to get the fill screw out and the pan screws take an odd-size (slightly larger than most on the car) torx bit. You'll need a new filter, pan gasket and rubber o-ring for the fill screw as well as 3.5qts of ATF. I was worried the chassis would flex with the bracing removed and I'd have to get fancy with a jack, but it went back together with just hand pressure. You could possibly work around the sway bar, but it's super-easy to unbolt and get completely out of your way.

My ATF temp was about 35C when I checked it, btw.
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Old 01-03-2013, 01:54 PM   #32
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Cool, I want new sway bushing anyway. There's an interchange for the $30 urethane ones at Advance Auto.

I just got an ultra-gauge for my Tiguan, I wonder if it will report AT temp on the Porsche?

http://ultra-gauge.com awesome unit.

I'll come back later.
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Old 01-03-2013, 03:21 PM   #33
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Thanks guys. Our Boxster has 10K miles and is an '07. It pretty much comes out on sunny days for PCA drives. I was debating on changing the Tip fluid during the "put it away for the winter" oil change last November, but was talked out of it. Like Macster we (aka my wife) wants to keep this one forever as she loves it, so I did not feel good about being talked out of this service. I will get it done in the Spring when the car comes out of hibernation.
An automatic transmission fluid change for a 2007 with just 10K miles on the odo is a bit premature.

I can certainly understand your desire to do what you can within reason with the idea of extending the Tip's service life but, well, as I mentioned above, in this case the service is premature.

If you really want the fluid changed though, be aware that one way to deal with someone trying to talk you out of the service and not having any real good reason (though he may be trying to prevent you from in this case throwing money away which ain't a bad reason to talk you out of the service) is to listen and then say thanks for the info but I have thought it over and want the service performed.

You are paying for this so it is not like you are asking for a freebie. If you still get push back then ask the person if you can't get the car serviced the way you want it here where would he recommend you take the car for service?

This works pretty good when you have a lot of choices such as I have where I live. If you only have one Porsche dealer in town and none close by...be careful about issuing an ultimatum.

Forgot to mention the car/Tip will be ok but next year before you put it away if you want at the same time the oil/filter is changed have the Tip fluid/filter service done that would be a good time. If you haven't had it done have the brakes flushed/bled too.

Try to avoid driving the car straight home and tucking it away for the winter.

After any service I like to drive the car some just to make sure all is well. It is always best to discover there's a problem -- but I do not expect there will be a problem -- as soon after the service as possible rather than several months after.

Last edited by Macster; 01-03-2013 at 03:44 PM.
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Old 01-04-2013, 07:53 PM   #34
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Thanks Macster. This helps. The "don't do it yet" came from my local dealership's SA who I have a great relationship with (and is a very capable guy). So between the two of you I will listen and hold off. His recommendation was to do it at the 10 year mark if it made me feel better ( assuming we put miles on the car at the same rate). He also knows I tend to service my cars more often than necessary and in this case he really pushed back on this as "absolutely unnecessary at this point".
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Old 01-04-2013, 09:13 PM   #35
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Update: Leveled my car (with an actual level) in my garage on various thickness of scrap lumber and repeated the ATF level check procedure. Added about a half liter until it started drizzling out the hole, then had my wife start the car in Park, and I pumped every last bit I could out of the bottle. Was way easier on the lift when I could hold the bottle upright... The transmission was still relatively cool (33C) when I finished , and I think I got about 3.6-3.7L into the transmission, all-told. Hope it was enough; I ran out of fluid before it started drizzling out while idling.

Shifts are a LOT smoother now. Still shifts a tad rougher than silky smooth, but I don't think it's really any rougher than it was 5 years ago. I did have a single odd moment after braking heavy, then turning sharply while accelerating where the car shuddered a bit, almost like ABS but in the drivetrain during acceleration that really worries me. No grinding sounds or anything like that, but it felt like a bad shift. I tried to replicate it, but couldn't. I'm hoping it was just PSM reacting to gravel or something, though it didn't feel like it and I didn't see the PSM light blinking.
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Old 01-05-2013, 10:09 AM   #36
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Default As i said before - ZF suggests 50k. Then again, i would think 5+ years

... is another good interval. You do want to perform the service, it not lifetime. But 10k is very low. My point is to trade off the miles with the years.

Grant

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Originally Posted by mgerber View Post
Thanks Macster. This helps. The "don't do it yet" came from my local dealership's SA who I have a great relationship with (and is a very capable guy). So between the two of you I will listen and hold off. His recommendation was to do it at the 10 year mark if it made me feel better ( assuming we put miles on the car at the same rate). He also knows I tend to service my cars more often than necessary and in this case he really pushed back on this as "absolutely unnecessary at this point".
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Old 01-17-2013, 03:02 AM   #37
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Castrol USA fluid selector recommends their Hi-Miles ATF as well as Import Multivehicle.

http://www.castrol.com/castrol/LubesSelector.do


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Old 03-05-2017, 05:37 PM   #38
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Originally Posted by sjfehr View Post
Wayne @ Pelican Parts wrote "The Porsche part number for the transmission fluid is 999-917-545-00, but is almost $35 a liter. The Boxster also can use off-the-shelf Esso LT 71141, or Pentosin ATF-1, both available along with gasket/filter kits from PelicanParts.com. I would avoid using any other type of fluid in your transmission. Also, use the same fluid for the entire replacement process - mixing and matching different types of transmission fluid can cause your transmission to fail."

What I don't get is why Wayne says to use ATF-1 or LT 71141 for the entire replacement process, but then cautions against mixing different ATFs; without dropping the transmission and draining every drop, you're never going to get all the old stuff out; he suggests on the forums that changing fluid 3x will get it all out, but mathematically, 3 changes is still 80% new/20% original. Pelican Parts only sells these alternate fluids, not the Porsche part# stuff, and seems pretty clear most people use them without issue, but I was hoping to confirm because last thing I need is to gel ATF or whatever the potential adverse mixing reactions are. Honestly, I don't even know how I'd go about finding out what fluid Porsche originally put in. I ordered the filter kit & pump from Pelican and am tentatively planning on using Pentosin ATF-1, which is available at my local O'Reillys.
Years later, im courious how it turned out for you. Just changed my 2005 BMW 530i's transmission fluid for its first time. Used ZF Lifeguard 6; however, came up short. Thinking about topping off with the Pentosin ATF-1.
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5hp19fla, approved, atf, atf1, boxster, castrol, fluid, high, lifeguardfluid5, lifetime, mercon, milage, mix, pentosin, porsche, transmax

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