Re: Newbi question: How to change the transmission fluid RR 2003
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Re: Newbi question: How to change the transmission fluid RR 2003
The official ZF repair manual for the 5HP24 states “The oil does not have to be changed until it has been in use 10 years”.
ZF’s latest LifeGuard fluid brochure states "Oil regeneration and oil filter change beyond 100,000 miles will have a positive effect on the service life ....." so they clearly recommend an oil (& filter) change late in the transmission's "lifetime"
Their latest ‘List of Lubricants’ (TE-ML11) includes the following statement (though they could probably do with getting another English translator) :
“ZF 5 and 6-speed as well as the ZF 4HP20 automatic transmissions are filled maintenance-free with specially developed partially synthetic ATF oils. Maintenance-free fills are intended for normal operating conditions.
Especially driving at very high operating temperatures can result in accelerated aging or increased wear of ATF oils. It is recommended, in the event of severe operating conditions, such as :
- frequent highway driving in top speed range,
- offensive, sporty driving style,
- frequent trailer operation,
being above average, oil purification (oil change) on automatic transmissions is recommended between 80,000 km and 120,000 km, or 8 years, depending on the load.”
Would anyone care to admit to having an ‘offensive, sporty driving style’?
Clearly they’re saying that if you do a lot of high speed driving, or hard driving, or towing (which causes the fluid to operate at elevated temperatures) they recommend a fluid change between 50,000 and 75,000 miles (or after 8 years).
Phil
The official ZF repair manual for the 5HP24 states “The oil does not have to be changed until it has been in use 10 years”.
ZF’s latest LifeGuard fluid brochure states "Oil regeneration and oil filter change beyond 100,000 miles will have a positive effect on the service life ....." so they clearly recommend an oil (& filter) change late in the transmission's "lifetime"
Their latest ‘List of Lubricants’ (TE-ML11) includes the following statement (though they could probably do with getting another English translator) :
“ZF 5 and 6-speed as well as the ZF 4HP20 automatic transmissions are filled maintenance-free with specially developed partially synthetic ATF oils. Maintenance-free fills are intended for normal operating conditions.
Especially driving at very high operating temperatures can result in accelerated aging or increased wear of ATF oils. It is recommended, in the event of severe operating conditions, such as :
- frequent highway driving in top speed range,
- offensive, sporty driving style,
- frequent trailer operation,
being above average, oil purification (oil change) on automatic transmissions is recommended between 80,000 km and 120,000 km, or 8 years, depending on the load.”
Would anyone care to admit to having an ‘offensive, sporty driving style’?
Clearly they’re saying that if you do a lot of high speed driving, or hard driving, or towing (which causes the fluid to operate at elevated temperatures) they recommend a fluid change between 50,000 and 75,000 miles (or after 8 years).
Phil
Re: Newbi question: How to change the transmission fluid RR 2003
I’m in complete agreement with DeltaC on this one. There is no suction on the ‘cooler-out’ side by which the fresh fluid would be drawn in. The fluid flow through the cooler pipes & cooler comes wholly from it being pushed through by the pump. The transmission pump flow incidentally is such that, even at tickover, it would take less than a minute to circulate the full fluid capacity of the transmission. Pump flow rate saturates at around 47 litres/minute at engine speeds above 2500rpm as the suction flow valve kicks in to minimise losses (diverting the excess flow back to the suction side of the pump).
Phil
I’m in complete agreement with DeltaC on this one. There is no suction on the ‘cooler-out’ side by which the fresh fluid would be drawn in. The fluid flow through the cooler pipes & cooler comes wholly from it being pushed through by the pump. The transmission pump flow incidentally is such that, even at tickover, it would take less than a minute to circulate the full fluid capacity of the transmission. Pump flow rate saturates at around 47 litres/minute at engine speeds above 2500rpm as the suction flow valve kicks in to minimise losses (diverting the excess flow back to the suction side of the pump).
Phil
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Re: Newbi question: How to change the transmission fluid RR 2003
I played with it today a little. Tested radiator for stoppage, and it was barely leaking any coolant out the bottom/ with drain unscrewed
That was most likely cause for Trans Overheating issues. Removed radiator in 20 min (thanks RSW solutions for Youtube tutorial!) and flushed it out with hose, then blew out lower openings with compressed air, and after a while was able to get good flow to the bottom rows. Then I shot some compressed air into the transmission cooler (water passages), and they were clean and wide open. Threw new heated thermostat in there while it was accessible (Behr / $65). Didnt have any G48 handy, so i filled it with water while it was running, and then added some Cascade dishwasher detergent (no suds). Ran to VW dealer and got some coolant, back home, flushed out the system (which removed more silica deposits) and filled with G48. Drove around all day, highway, stop-go, let it idle outside garage for 45 min, no errors, no leaks, nice and cool, transmission shifts smooth. Gotta change trans oil next
I played with it today a little. Tested radiator for stoppage, and it was barely leaking any coolant out the bottom/ with drain unscrewed
That was most likely cause for Trans Overheating issues. Removed radiator in 20 min (thanks RSW solutions for Youtube tutorial!) and flushed it out with hose, then blew out lower openings with compressed air, and after a while was able to get good flow to the bottom rows. Then I shot some compressed air into the transmission cooler (water passages), and they were clean and wide open. Threw new heated thermostat in there while it was accessible (Behr / $65). Didnt have any G48 handy, so i filled it with water while it was running, and then added some Cascade dishwasher detergent (no suds). Ran to VW dealer and got some coolant, back home, flushed out the system (which removed more silica deposits) and filled with G48. Drove around all day, highway, stop-go, let it idle outside garage for 45 min, no errors, no leaks, nice and cool, transmission shifts smooth. Gotta change trans oil next
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