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Need towing advice - managing transmission temp (petrol engine)

Discuss your latest mods or ideas, and anything to do with the BMW X5 (E70).
RhythmMachine
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Need towing advice - managing transmission temp (petrol engine)

Post by RhythmMachine » Fri Jun 21, 2024 10:35 pm

X5Sport wrote: Mon Jun 17, 2024 9:32 pm Thanks for the detailed update. Petrol X5s are pretty rare in the UK with the vast majority sold being diesel until it got flagged as ‘demon fuel’ a few years back (think VW Dieselgate time). The torque of the diesel IL6 engines is so useful. I know the diehard V8 fans will stay with their engine symphonies, but the IL6 petrol isn’t bad either, just a bit thirsty :D
I do miss the effortless torque from the diesel and the 1000km range on a single tank (speaking about my ML320... I don't have direct experience with a diesel X5), but there are so many very expensive problems that result from the emissions equipment that I wasn't willing to take the chance. Repairs are prohibitively expensive once things start to go with the DPF, EGR, DEF and so on, and the delete process seems to be around $4K CAD, which would have been about 30% of what we actually paid for our 35i. Just too risky for me.
2003 E46 M3, 2012 E70 X5 xDrive35i LCI

RhythmMachine
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Posts: 8
Joined: Tue May 14, 2024 5:08 pm

Need towing advice - managing transmission temp (petrol engine)

Post by RhythmMachine » Sun Jul 07, 2024 11:12 pm

We got out again last weekend with flatter terrain, but I gave it a try with the transmission in automatic sport mode.

Fuel efficiency may be a bit better: I had it in Sport Automatic for the first half of the trip to our campsite and got 17l/100km for the trip there (13.mpg). The temp, though, was significantly higher, getting up to 109 C on my gauge for ATF, which should translate to 101 C for actual transmission temperature.

I switched back into manual shift mode for the remainder of that trip and most of the return and it pretty consistently stayed between 98-103 C on my gauge for ATF (which would result in transmission temp of 91-96 C). Mileage on the return trip was 18l/100 km (13mpg), so still pretty good.

We have an upcoming long highway trip without the trailer, so I'm curious to monitor and see what the temps are like on that to determine how much impact the trailer actually has on the operating temp.
2003 E46 M3, 2012 E70 X5 xDrive35i LCI

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