I would not advocate a full flush of the gearbox....
Gearbox Fluid is a very good detergent....currently inside the box hidden in harmless nooks and crannies is a build up of debris....harmlessly sitting out of the way do no bother!
When you only change the sump contents during a 'normal' fluid change, you change about 65% or so of the original fluid, the rest sits in the Torque Converter.
You then refill with clean fluid - diluting the remaining 35% or so.
This dilution of the clean fluid, slows down the detergent effect.
NOW....
If you mega flush and take all the old fluid out and replace with new, it will start to strip clean the gearbox, and pull all that accumulated debris into the oil and box, which can cause grief.
It is known as New Fluid Syndrome (or something similar)....
Some get away with it, and some have reported it has trashed the box requiring a rebuild due to contamination!
I would do as the others have suggested, drain and replace filter and fluid...then drain the fluid a few hundred miles later and replace....
The dilution will disturb some of the harmless crud into the oil, but the second flush will start clearing this out before it has a chance to wreck everything!
Also on the M62 it doesn't have an oil breather as such....it uses a PCV valve that maintains a slight vacuum in the sump and draws oil vapours through a cyclonic separator for condensing back into oil and drains into the sump again!
The PCV valve diaphragm splits and can cause idle issues, a reduction in MPG and cause the MIL/CEL light to illuminate due to fuel trim issues!
Gearbox Fluid is a very good detergent....currently inside the box hidden in harmless nooks and crannies is a build up of debris....harmlessly sitting out of the way do no bother!
When you only change the sump contents during a 'normal' fluid change, you change about 65% or so of the original fluid, the rest sits in the Torque Converter.
You then refill with clean fluid - diluting the remaining 35% or so.
This dilution of the clean fluid, slows down the detergent effect.
NOW....
If you mega flush and take all the old fluid out and replace with new, it will start to strip clean the gearbox, and pull all that accumulated debris into the oil and box, which can cause grief.
It is known as New Fluid Syndrome (or something similar)....
Some get away with it, and some have reported it has trashed the box requiring a rebuild due to contamination!
I would do as the others have suggested, drain and replace filter and fluid...then drain the fluid a few hundred miles later and replace....
The dilution will disturb some of the harmless crud into the oil, but the second flush will start clearing this out before it has a chance to wreck everything!
Also on the M62 it doesn't have an oil breather as such....it uses a PCV valve that maintains a slight vacuum in the sump and draws oil vapours through a cyclonic separator for condensing back into oil and drains into the sump again!
The PCV valve diaphragm splits and can cause idle issues, a reduction in MPG and cause the MIL/CEL light to illuminate due to fuel trim issues!
