Tiptronic transmission oil change

[JFP in PA]

Originally Posted by Smallblock454

OK, that is bad news. So you can only dilute the ATF. And if you have a volume of 9.5 litres and only get ould approx. 3.5 litres that is a never endng process.

Mercedes also had this lifetime filling ATs. In 2008 or 2009 they decided to bring back drainage bolts on the torque converters, because the lifetime didn't work and the cab drivers were really pissed by broken ATs. Hope the lifetime filling works better on Porsche AT.

Regards, Markus

The real trick here is to service the trans regularly as mentioned by another poster above, which will continuously dilute the old fluid with new, getting at least some of the debris out of the trans. If you let one of these go 75-90K miles, it is going to be full of crud and harder to clean out.

[Luv2Box]

Not having tools or a place to do maintenance can make the process described here costly. I had mine serviced at 86K and it was just shy of $400 and that was at an indy. Doing it 3-4X would be cheaper than a new trans but it's still a chunk of change. I had always heard there was a pressure unit that flushed the fluid out but it sounds like that was an internet myth. It's disappointing that Porsche doesn't have a tool to flush the trans and would leave it to having the customer pay for 3-4 changes just to get new fluid. I thought AAMCO had a pressurized system to drain auto trans's.

[911monty]

Luv2box; There are several trans flush systems out there that use pumps to flush the trans. Some attach directly to the filter pick up tube and pump through the trans. They do a good job of removing the old fluid.
Unfortunately auto trans have very complex valve bodies that control fluid flow and pressure which controls shift points. There are also clutch packs for EACH gear. These clutches are very thin and are the source for a lot of the debris circulating within the transmission. A cause of failure on a long neglected trans is the removal of The friction material circulating in the fluid. This material helps keep the clutches from slipping. When it is removed the clutches can begin to slip in the clean fluid and then the trans will fail. More than a few well meaning car guys have serviced the trans only to have it fail.
Change your auto trans fluid regularly and it will last much longer. I have a BMW with lifetime trans fluid. I change it regularly. Drop the pan, change the filter, add 4 qts. Remember they also recommend 10k oil changes.

PS. I mentioned the valve body earlier. The only way to clean is to use a system such as JFP mentions, that moves fluid through the entire trans.

[Luv2Box]

Originally Posted by 911monty

Luv2box; There are several trans flush systems out there that use pumps to flush the trans. Some attach directly to the filter pick up tube and pump through the trans. They do a good job of removing the old fluid.
Unfortunately auto trans have very complex valve bodies that control fluid flow and pressure which controls shift points. There are also clutch packs for EACH gear. These clutches are very thin and are the source for a lot of the debris circulating within the transmission. A cause of failure on a long neglected trans is the removal of The friction material circulating in the fluid. This material helps keep the clutches from slipping. When it is removed the clutches can begin to slip in the clean fluid and then the trans will fail. More than a few well meaning car guys have serviced the trans only to have it fail.
Change your auto trans fluid regularly and it will last much longer. I have a BMW with lifetime trans fluid. I change it regularly. Drop the pan, change the filter, add 4 qts. Remember they also recommend 10k oil changes.

PS. I mentioned the valve body earlier. The only way to clean is to use a system such as JFP mentions, that moves fluid through the entire trans.

Good to know, thanks.