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Join Date: Jul 2015
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Road Trip Complete! Cooling question...
Just returned from a 1500 mile round trip to the beach for a week. At first, I was nervous about driving my E60 M5 on this trip. I've never had any issues thus far with my car, nor taken it on any long road trip away from home. But some of the horror stories I read on this forum about SMG issues, Vanos, and rod bearings...I felt like I was taking a chance. Before this vacation trip, the longest round trip I've taken with the M5 was around 200 miles and put approx. 2000 miles on it since purchase last summer. The car ran very well, set cruise at 75mph and averaged 20.5mpg.
Maintenance before trip;
- Replaced SMG motor relay and Transmission Oil Pump relay
- Checked SMG hydraulic fluid level, didn't even need topped off.
- Bled Slave Cylinder and SMG pump block. (shifts much faster)
- Engine oil changed less than 500 miles before trip
- Replaced fuel filter (just PM and piece of mind)
- Re-Balanced all wheels / tires, set pressures at 40psi.
- Checked coolant and brake fluid levels, both were fine.
Based of suggestions from members, I packed a spare tire, 2 litres of TWS 10-60 oil, small tool kit, small jack, jumper cables, and portable 12v air compressor. Thankfully I didn't need to use any of these items, in fact, when I departed, my engine oil level was at 1.0, when I returned, its shows 0.9L after checking. Glad to see my engine is not consuming oil!
Now, since cooling temperature has become a topic in the past week, the only thing that concerned me during the trip was the water temp got just a little past 210 deg F when driving down the interstate with AC on. I'd say 215-220 max. When I turned the AC off, the water temp dropped just below 210. Ambient temperature was 90 - 95 deg. F. After driving 100 miles or so with temperature around 215, I was no longer concerned and kept the AC on. I know the engine has to work slightly harder to run the AC compressor, so I assumed this was all. Coolant level is spot on and cooling fan is working normal, cycling through all the speeds.
Typically, I've never seen water temp rise past 210, yet again, this is the first time I've driven non stop on a tank of gas in 90+ deg weather. Hopefully this is not abnormal.