Sorry stickshifter, that data is (by far...) not sufficient to evaluate the differences of the 2 transmission versions. At least max input rpm, max output torque and max transmittable power is required.See post #35, or google "ZF 8HP" - plenty of info on these transmissions. As the numbers of the variant go up (8HP51, 8HP55, 8HP70, etc.) they are built to handle more power. I think we can trust Wikipedia on this, but there are other sources if you look.
ZF 8HP transmission - Wikipedia
en.wikipedia.org
Coming from a manual transmission (the grenadier will be my first auto) what a great video. Some interesting service notes that I took away- having to replace the entire oil pan as the filter is built in, and the method for checking the oil level, and very specific oil requirements.
Yes, that would be very helpful!
My local BMW Service specialist said don't follow BMW service intervals.
It's a little early, but what is the recommended interval for these transmissions?
Depends upon driving style , loads e.g. towing etc.
I have always known that official dealers or service companies push maintenance intervals, they earn money on it.
My 2004 tacoma (350k miles/563k km) gets 5k mile/8k km oil changes and 15k mile transmission/diff oil changes and the only major damage I've ever had was when the wife swam it and didn't tell me. Toyota's stock breather scheme allowed water into the transmission via the breather, which eventually ruined the 1st gear synchro gear. I ask because the ZF 8HP factory oil change interval is 50-75k miles (81-120k km). I'm curious to hear what @DaveB's friend had to say about shortening that interval.
Use the recommended and lower it when your really think the car has suffered a lot! That is what I do.
Got it. I was probably thinking of other posts on this topic, in which people didn't know that there were different variants of transmissions between the B57 and B58, so I was just pointing out that the diesel one can handle more torque than the gasser. Why are you looking for those specifications? Will this data be a factor in you deciding between the B57 and B58? Are you planning on tuning either of those engines?
Not a friend
And how frequently will be related to how hot you run it. Heavy towing in hot weather is probably the biggest assault on transmission oil, but stop & go driving is also bad. Its also tough on a transmission to shift between forward and reverse if the vehicle is moving. But I've only owned manual transmissions, so take that with a grain of salt...
Pretty sure you have to have your foot on the brake before you can go into drive or reverse in ZF transmissions
That's good that your BMW tech is already thinking that regular BMW service intervals may not apply to the Grenadier. Unlike Mercedes, Jeep, Ford, Ram, and other makers of heavy duty vehicles, BMW doesn't make a vehicle like the Grenadier (which is why - presumably - they agreed to let Ineos use their engines). There may be a bit of a learning curve in the BMW service centers.
No and No. I already have decided for the diesel, and I don't plan to tune. And must admit that I rather would have had a manual transmission...
I have driven pretty much every kind of car transmission
