So I am thinking a transmission fluid and filter. How many miles or Km should go by before do this.
Supposed to be "fill for life", not that I believe it.
Based on what I've found I think using the NAG1 severe duty service schedule might be advisable.
Today I searched for Shell-L12108 and found some interesting information from the jeep forum, copied verbatim:
If you are speaking of the ZF 8spd transmission they all basically use the same method to service the transmission.
Procedure (we need to verify with the service manual but all ZF transmissions I have serviced operate this way)
Open the fill plug (by the way the fill plug is usually so tight that you need to tap it hard with a hammer on either a torx (typical) or Allen fastener
Open drain plug and drain old Lifeguard 8 out of the pan.
If you wish to change the filter typically (again we need to see the service manual) the pan and filter are an integral part and you take the 20 some bolts out after draining and expect another liter to be in there too. Some ZF transmission use a separate filter and pan, it all depends on what Jeep spec'ed.
Now to refill this is where ZF departs from almost all other transmission manufacturers. Fill transmission engine off to weeping out of fill hole obviously drain plug in. Then start car shift through all the gears until the transmission temp reaches 80-120 F. Now with the transmission RUNNING refill until weeping out the fill hole, put the plug in once done and that is it.
I am looking forward to seeing what the service manual says but I am guessing this is pretty close.
Here is where I get my ZF fluids and filters. Only the LG 8 is listed but it is listed for the 8HP70
The
CTSC - ZF Parts < linky
Hope this helps some. I am sure we will all learn more once more service information is available...
Next post from same poster:
We will have to see what the interval is but typically the manufacturer recommends a service at 100K miles and ZF at 50K miles. I will be changing mine at around 35-40K miles and every 40-50K miles there after.
No light I am aware of on any ZF transmission. Some transfer case cars do get a light to change their fluid.
I defer to the manual which I have not read in detail yet but ZF is very consistent with what they recommend...
This is from ZF responding to an Audi owner with the 8spd transmission. 2013
Your ZF automatic transmission is filled maintenance-free with specially developed partially synthetic ATF oil. Maintenance-free fills are intended for normal operating conditions.
However, 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.
In each case, only released ATF oil may be used for oil changes. And oil changes must be performed in accordance with the relevant specifications.
This means that there isn't such a thing as lifetime fill and that virtually any kind of driving we do we should change the fluid at 50K miles or is you wish 75K miles...
Robert
