Hawkeyes

89 s4 auto is due for a transmission fluid flush & fill. Has anyone had this done with a T-tec sytem (drains 100% of old fluid including torque converter) on the 928?

Any reason I should NOT have a shop do it using the T-tec and instead do it myself (on the cold concrete floor, ATF dripping on my body, no sympathy from wife)?

Hawk

90 S-4

I had it done on another car and think it is the only proper way to do a fluid change.
But, when I came back to him with my S4 he put it on the rack to look at how the lines
were attached and said I would need to install some secondary fittings in parallel with the oem
ones. The fittings he needed would need to accept the corresponding fitting he would attach
to it. One something like a retractable ball sleeve you'd see on the end of an air hose.
Drive your car over to him and see what type of fitting he would need to have on there so
he could hook up his half of the hose. You'll need two fittings, one on the discharge & one
on the inlet. Once done you'll be able to get the fluid changed more frequently as it should be.

dr bob

Since you can easily drain the torque converter on your 928, the 'flush-through' method is not any real benefit unless your coolers and lines are full of burned fluid. You'll want to inspect the bottom of the trans pan and put a new filter in it anyway, making a flush-through change even less desirable.

There are some cars that really benefit from thse machines and procedure. Chrysler, BMW, and some others that have transmissions that "can't be serviced" are candidates. Some others that are tough on fluid and where the converter doesn't drain down great candidates. For the 928, it's a way for a tech to make money while saving his/her own labor time needed to drop the pan.

My opinion. Others may see it differently.

Roger

I had an old 93 camary that went through this process. It worked great!! I asked the attendent if there was a filter that shoud be replaced and he told me that toyota used a metal screen. The process flushed the screen / filter. This was the only way to go with the camry or any other vehicle which does not allow you to drain the fluid completely.

The 928 is a different story. Since we use the MB transmission, we have the ability to drain all of the fluid (including the torque converter) from the trans. In addition, the auto trans uses a paper type filter. Because of these 2 reasons, I would not use the t-tec process. I would drain the fluid (pan & converter) and replace the filter & gasket.

Regards,
Roger
87s4

borland

I forget the quantities, but a normal drain and refill leaves a significant amount of oil unchanged.

For most, that is not a problem since the oil does not degrade in a significant amount. The main reason for the change is to inspect the sediment in the pan for abnormal wear.