Well there is no denying that Mackies have done well for many people on here but Tony didn't have such a good experience.
We would all be wise to remember both the good and the bad.
As far as the sucky machine is concerned I can see the logic in what Marcin was trying to point out as was explained to him was the sucky machine will actually be pulling vacuum on the gearbox to suck oil out of it.
Now shaft seals by their nature are only designed to seal in one direction and do so by pressure behind the seal.
It is possible in theory to damage seals or disturb how they are sitting by pulling a vacuum against its normal direction of operation.
Personally I think the best way to deal with the gearbox oil change is take the whole thing out and drain the torque convertor.
That however is not practical so the safest and best alternative is a standard drop and drain, new filter and run for a bit and drain and fill again a couple of times to flush the old oil out.
That is however using a lot of oil to flush an old gearbox, as we all know gear oil for the D3 is eye wateringly expensive so one has to way the pro's and con's and decide how they want to pay to play.
__________________
Del
|