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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 07-10-2014, 11:44 AM   #21
AndrewReaganM
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So you guys are telling OP that he might as well not even try to fix it? These engines must not be nearly as good as I thought they were. Lol

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Old 07-10-2014, 11:48 AM   #22
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So you guys are telling OP that he might as well not even try to fix it? These engines must not be nearly as good as I thought they were. Lol

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Sure try and fix it but first decide where to draw the line. Obviously to a certain point, a new engine would be cheaper. That depends on the extent of the damage. Please do a compression test. Not that expensive.
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Old 07-10-2014, 12:09 PM   #23
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Maybe the red is buffered as well?

I've killed a a Toyota by overheating once and it took continuous driving over a few days while overheating to kill it.
A lot of current (and most older) Toyota motors are steel block with steel head. Steel has a higher heat capacity and are less prone to warping or other damage due to high temperatures. The newer Toyota motors are now aluminum which will be prone to the same issues. The difference is in the cooling system design (and other designs too ) which is much more robust on the Toyota than on the BMW.

BMW M54 is aluminum block and aluminum head, which is far more prone to heat issues than steel.

You can overheat a Ford V8 for days if you want and all you need to do is let it cool down before restarting, there probably won't be lasting issues doing this but they are all steel block/steel head motors.

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I've heard these engines blow a head gasket if people don't charge the cooling system properly and it sits in the red too long. They're really sensitive to heat. It's possible if the car is moving at highway speed there is some airflow around the engine but that can't help much.
They are sensitive to heat because of aluminum construction. If it was steel there wouldn't be nearly as many issues.

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Grey numbers show the stock temp gauge. If you leave the center, youre already dead. Regular operating temp is 86-98 C. Id know. Ultra Gauge
Operating temp and max temp are two different things but I get your point. The dummy gauge does cause problems.

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So you guys are telling OP that he might as well not even try to fix it? These engines must not be nearly as good as I thought they were. Lol

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No one is saying that, people are saying to prepare for the worst. We all hope everything is fine.
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Old 07-14-2014, 01:00 AM   #24
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The op never came back to chime in. So I guess we will never know the result.
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Old 07-14-2014, 02:13 AM   #25
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Originally Posted by SamDoe1 View Post
A lot of current (and most older) Toyota motors are steel block with steel head.
It was aluminium head and iron block. For cars Toyota used aluminium heads and iron blocks for a very long time before switching to all-aluminium. The Camry got an all-aluminum V6 way back in 1994. The 4-cylinders switched to aluminium blocks a little bit later, but they haven't had iron heads since probably the late 70's or early 80's. Trucks and SUVs retained the iron head design longer than cars but I doubt any current Toyota motors uses iron heads, or any other manufacturer for that matter.

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Old 07-14-2014, 09:16 AM   #26
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It was aluminium head and iron block. For cars Toyota used aluminium heads and iron blocks for a very long time before switching to all-aluminium. The Camry got an all-aluminum V6 way back in 1994. The 4-cylinders switched to aluminium blocks a little bit later, but they haven't had iron heads since probably the late 70's or early 80's. Trucks and SUVs retained the iron head design longer than cars but I doubt any current Toyota motors uses iron heads, or any other manufacturer for that matter.
I stand corrected. So then Toyota must just have a better cooling system overall.
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Old 07-14-2014, 02:52 PM   #27
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I stand corrected. So then Toyota must just have a better cooling system overall.
Toyotas and most other cars have a more robust cooling system.
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Old 07-15-2014, 08:54 AM   #28
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Have the people here who are saying "red is dead" had engine failures?

While 240-250*F is HIGH, I wouldn't think that would immediately taco your cylinder head. Weak design on BMWs part?

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