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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > reliability vs driving habits



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      05-15-2014, 02:43 PM   #1
fredcase
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reliability vs driving habits

How many fuel pumps die because people run the tank dry? How many Turbo failures due to people firing up their car and getting on it right away without oil hitting temp, or shutting car off right after a good beating?

Discuss.
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      05-15-2014, 03:07 PM   #2
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Impossible to know without accurate research/studies lol.

All talks on this thread would be just speculative
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      05-15-2014, 03:38 PM   #3
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You will kill your fuel pump if you drive it all the way down to empty enough times. That's a fact of all cars. When your fuel light comes on, you should go get fuel. You've got a buffer of about 20-30 miles before you hit the "you're stressing your fuel pump" mark.
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      05-15-2014, 03:39 PM   #4
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You will kill your fuel pump if you drive it all the way down to empty enough times. That's a fact of all cars. When your fuel light comes on, you should go get fuel. You've got a buffer of about 20-30 miles before you hit the "you're stressing your fuel pump" mark.
the fuel pump is "cooled" by sitting in the tank, so basically your fuel turns into one big heat sink

less fuel means the pump will run hotter, so even if you aren't running it dry, keeping it low will also harm the pump

see this a lot with those people that just put in $5 at a time etc
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      05-15-2014, 03:43 PM   #5
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Do our cars have Turbo timers that pump oil after car is off? I've read on a few other platform forums about how bad hitting boost is when your oil isn't at temp. Or hitting boost at low rpm.
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      05-15-2014, 03:48 PM   #6
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Do our cars have Turbo timers that pump oil after car is off? I've read on a few other platform forums about how bad hitting boost is when your oil isn't at temp. Or hitting boost at low rpm.
If the oil is hot, the electric water pump and oil cooler will continue to run after the car is shut down. At least mine does.
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      05-15-2014, 04:01 PM   #7
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oil pump? water pump is electric, but isn't the oil pump mechanical?
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      05-15-2014, 04:03 PM   #8
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Oil still flows even if it's not up to temp, I don't thing that would be a reason for a turbo to fail early.
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      05-15-2014, 04:05 PM   #9
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Oil still flows even if it's not up to temp, I don't thing that would be a reason for a turbo to fail early.
You’re probably right, but still no reason to risk it. Modern oils are pretty damn good when cold.
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oil pump? water pump is electric, but isn't the oil pump mechanical?
Yes, chain driven.
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      05-15-2014, 04:05 PM   #10
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Oil still flows even if it's not up to temp, I don't thing that would be a reason for a turbo to fail early.
it flows, yes, but when it's dead cold it's certainly not going to lubricate well at even engine redline, nevermind the turbos spinning far faster than that
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      05-15-2014, 04:07 PM   #11
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You’re probably right, but still no reason to risk it. Modern oils are pretty damn good when cold.

Yes, chain driven.
yeah, that's what I thought

oil will not flow with the motor off. oil is only for lubrication on our cars tho, the effective cooling is water and that will keep flowing with the electric pump if the car decides temps are too high still.
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      05-15-2014, 04:17 PM   #12
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Isn't oil used to cool turbos? I think I'd take my oil cooler rather than hotter if that's the case.
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      05-15-2014, 04:20 PM   #13
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Isn't oil used to cool turbos? I think I'd take my oil cooler rather than hotter if that's the case.
on old cars it was, but lead to the issues like you just mentioned, necessitating turbo timers, etc

once coolant pumps went electric, the answer was obvious
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      05-15-2014, 04:26 PM   #14
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      05-15-2014, 04:39 PM   #15
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So our turbos are water cooled, and don't have oil feed lines? My concern with shutting the car off super hot was the oil in the Turbo oil feed and return lines would burn and get caked.
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      05-15-2014, 04:44 PM   #16
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So our turbos are water cooled, and don't have oil feed lines? My concern with shutting the car off super hot was the oil in the Turbo oil feed and return lines would burn and get caked.
they do have oil feed lines, but like most other pumps the oil stops when the engine does

the coolant will continue to circulate if this is a problem, so it should reduce the temps from dangerous levels quickly enough.

in fact, this is BETTER than idling a motor, as you're still generating heat with minimal coolant flow and oil pressure. Without the motor running, the fan/radiator can cool everything down faster.
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      05-15-2014, 05:51 PM   #17
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You will kill your fuel pump if you drive it all the way down to empty enough times. That's a fact of all cars. When your fuel light comes on, you should go get fuel. You've got a buffer of about 20-30 miles before you hit the "you're stressing your fuel pump" mark.
Sort of.

Have you done a fuel upgrade in one of these cars yet?
When I did my tank was almost empty but the bucket is full of fuel.

You'd have to run it to fumes to actually drain the bucket.
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      05-15-2014, 07:26 PM   #18
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Oil stops flowing when engine is shut. Pressing the pedal hard at low rpms heats up the turbo most and may not activate the cooling fan when engine is shut off due to the medium engine temp. Doing this repeatedly will cause premature wear and tear. A good way to drive turbo cars includes being easy on the accelerator last 2-3 minutes of the ride.
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      05-15-2014, 08:39 PM   #19
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This is about the most clueless bunch of people I have ever seen. Mosr of you don't know anything about what you are discussing. You should all trade in your cars and stick to hyundais.
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      05-15-2014, 08:49 PM   #20
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This is about the most clueless bunch of people I have ever seen. Mosr of you don't know anything about what you are discussing. You should all trade in your cars and stick to hyundais.
Why don't you enlighted this 'most clueless bunch of people' if you know better?
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      05-15-2014, 09:22 PM   #21
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The turbos are oil and water cooled. The water pump runs after the car is turned off to cool everything back down thus no need for a turbo timer.

The manual actually says not to let the car warm up (sitting still at idle) before driving it. Most say to just take it easy (less than 3500 rpm or so) for 5 or 10 mins or so to let everything warm up. I wait for the oil temp gauge to start moving.

There is absolutely nothing wrong with running your tank down to E. This is normal and the fuel system was designed to handle this. I probably wouldn't keep it there but who puts $5 in their bmw over and over anyway.

As far as the original question, there is no way to gather that data. You are thinking and worrying too much. Just drive the damn thing.
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      05-15-2014, 09:28 PM   #22
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....

The manual actually says not to let the car warm up (sitting still at idle) before driving it. Most say to just take it easy (less than 3500 rpm or so) for 5 or 10 mins or so to let everything warm up. I wait for the oil temp gauge to start moving.
...
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