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#1
08-29-2017, 02:09 PM
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Oil Temp Drops When Working Hard
I just had a question. I'm still pretty new to this car, and had the occasion to drive it across the state and back the other day. That means crossing several passes. The steepest is about 9 miles of 6% to 8% grade toping out at near 12,000', and the climb out of Denver gains around 5000' in 40 miles or so.
What I noticed was that when I start pushing the car uphill, after a little while the oil temperature would actually drop from a needle width below 210 degrees to 1/3 or so of the way down the gauge. This car had tons of power, and has no issues with climbing passes in any gear. I usually use sport mode so it can carry some RPM's, and sometimes put it in 3rd gear so it doesn't shift so much. I have never had a car that got COOLER running up passes in summer temperatures with the AC running before. Of course the air gets a bit cooler on the way up, but not enough to make that kind of difference. The water temp stays the same all the time. So, does this thing have an oil cooler that kicks in at some point? Whatever it is, I've never had a vehicle that takes those climbs with so little sweat! it's awesome!
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2002 e53 X5 4.6is Estroil blue/ Black interior (Build Date 04/02) 
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#2
09-05-2017, 06:36 AM
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Good day!!
Well, if I had to guess, it would be the fact that the air is indeed cooler and thinner, but the motor is pumping fluids faster than at the lower RPM's... It is working harder, but for the 4.6is, climbing hills is barely breaking a sweat for it... There is an oil cooler that has a thermostat on the N62 motors, but I'm honestly not sure about our 4.6L M62TU... Cheers!!!
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2001 E53 X5 4.4i (03-07-2001 build date) White exterior / hellbeige interior (6MT swap vehicle - Manny) 2002 E53 X5 4.6is (12-20-2001 build date) Imola Red exterior / M-texture interior (Red) 2003 E53 X5 4.4i (06-26-2003 build date) Silver exterior / Black interior (Silvester II) 2008 Mini Cooper S ragtop (04-17-2008 build date) Dark Silver exterior / Gray interior ( Topless) BMWCCA member (#4745)
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