[S6F]

I assume the 550i's, etc., also use high pressure fuel systems.
But I heard nothing about failures in their pumps. Do I have this
all wrong?

SteveFoster
'11 335i MT
grey/black

[maswastage]

All direct injection engines have high pressure fuel pumps. But the pump isn't the same across models. As far as I know, the failures are confined to the N54/55 engine line, and that's because the pump is unique to that engine.

[HoustonScott]

All those other engines don't run such high temps, no 260 degree oil temps for those engines.....wonder if that maybe related......

HS

[John 070]

I agree that it's N54-related, most likely. Nissan Juke, Hyundai Sonata, Chevy Cruze, Chevy Cobalt, they all use direct injection. None of them have fuel problems. Again, the HPFP is not the root cause, it's merely a symptom. My car was at the BMW dealership on 4 occasions overnight, one of which was 8 days. Never once was the HPFP the culprit.

[nbkkvv5]

Originally Posted by HoustonScott

All those other engines don't run such high temps, no 260 degree oil temps for those engines.....wonder if that maybe related......

HS

Highly doubt it. My temp has never ever gone over 240 and my pump failed at 8300 miles

[HoustonScott]

240 degrees is out'a control hot, shut down car and find out what's wrong. That's my point. Normal oil temps are 210-215. In very extreme air temps while towing or going up grade with loads maybe 220. So you just proved me right. Those pumps are buried in the side of the block are are doomed. It's a lemon of an engine always was and is....

HS

[Barbera335]

Originally Posted by HoustonScott

240 degrees is out'a control hot, shut down car and find out what's wrong. That's my point. Normal oil temps are 210-215. In very extreme air temps while towing or going up grade with loads maybe 220. So you just proved me right. Those pumps are buried in the side of the block are are doomed. It's a lemon of an engine always was and is....

HS

As far as oil temps go, up to 300 is fine and nothing to worry about. Most synthetic motor oils are designed to work up to temps of 400 so BMW having failsafe programmed around the 340 range provides a good comfort zone. I think your mistaking oil temps with coolant temps. Obviously coolant at 240 degrees would be way out of spec. As far as the N63, the High Pressure Pump design is completely different from the N54/55. On the N63 there are two High Pressure fuel pumps. One for each Bank driven off of a special lobe on the exhaust cam shaft. Same as the N73 motor from 2003 with BMWs first generation direct injection which has proved to be very reliable.

[tscdennab]

Just think about how many 50i models are sold compared to the 35i models. Maybe 1 to 10-15 ratio ? This is the explanation.

[HoustonScott]

You don't know what your talking about...

[Edward]

^ 240 out of control? No offense but you're the one who doesn't know what you're talking about.

240-250 is the middle range of the oil gauge in our cars. On the newer E92s 250 is shown as the perfect center point of the range of the gauge. The lowest reading is 160 and the highest reading is 340. In normal flat city driving, my car won't ever be over 240. I've driven my car hard as HELL uphill through canyons in Malibu in 90 degree weather and it never registered above 251-252. I'm sure part of that is due to the fact that the cooling system on the IS is so hefty, but still, it's not WAY over operating temps like you claim.

[etichi]

I think you may be talking past on another... Houstan drives a diesel, in which he is correct, 250 is to hot.

[Potty_Pants]

Originally Posted by Edward

^ 240 out of control? No offense but you're the one who doesn't know what you're talking about.

240-250 is the middle range of the oil gauge in our cars. On the newer E92s 250 is shown as the perfect center point of the range of the gauge. The lowest reading is 160 and the highest reading is 340. In normal flat city driving, my car won't ever be over 240. I've driven my car hard as HELL uphill through canyons in Malibu in 90 degree weather and it never registered above 251-252. I'm sure part of that is due to the fact that the cooling system on the IS is so hefty, but still, it's not WAY over operating temps like you claim.

Hate to say it but your off too...

just because BMW says 160-340 and anything inbetween is ok... doesnt make it so. a couple of years back they had another oil gauge that went up to 280 or some other number BELOW 340... and because our engines were running around 240-250... it was very close to the max temp of the guage.

Don read a book by its cover and dont believe its right just because bmw says so.


ppp

[ajsalida]

I was curious about the same question a while back (v8 DI turbo engines and HPFP). RealOEM shows a completely different part number and two per engine, one for each side. I would guess flow rate on a single pump not adequate for the N54? Have no idea. However same PN goes to the M version of the X5 & X6, so in terms of HP per pump (555/2) that is getting closer to the N54.

[Edward]

Originally Posted by Potty_Pants

Hate to say it but your off too...

just because BMW says 160-340 and anything inbetween is ok... doesnt make it so. a couple of years back they had another oil gauge that went up to 280 or some other number BELOW 340... and because our engines were running around 240-250... it was very close to the max temp of the guage.

Don read a book by its cover and dont believe its right just because bmw says so.


ppp

Reading comprehension fail. don't read my post by the cover. You could assume that I know that the guage range isn't indicative of appropriate temperature to a T.

I was mentioning that it is not "way over" normal operating temps. I bet almost everyone here with a 335 runs low to mid 200s. If you are able to keep it below 200 constantly, you are driving in freezing temps below 3000 rpms. I know that just because they chose 250 to be the center point, it doesn't mean that it's the perfect temp to be at. They merely did this to make us feel like mid point is where our engines should be.

[John 070]

Moral of the story is save up for the 550i, do not buy a 535i, as nice as the price looks.

[HoustonScott]

Yes they changed the gauge it was changed to make you feel better, I know what I talking about....even air cooled engines don't run oil temps that high..the porsche manual has you shut down if temps reach 240..the 335i engine is a looser....My e46 oil temps ran 212, you want just over 212 to run moisture out of oil. Even F1 engines turning 18 thousand RPM run just over 212, sorry you have been sold lemon engine, gear heads have know this for years and predicted problems, I know its hard to except, but it's true...sorry...

HS

[Edward]

I'm sure everyone here with an N54/N55 agrees that they were sold a lemon engine. GTFO. You can't even spell "loser" like an educated man.

[Brey335i]

1. I often see high oil temps in the other cars I drive

2. I never see 250 + degrees in my 335i. I don't know if you guys have the oil cooler but I usually chill out right around 210-230

[mryakanisachoad]

Originally Posted by HoustonScott

Yes they changed the gauge it was changed to make you feel better, I know what I talking about....even air cooled engines don't run oil temps that high..the porsche manual has you shut down if temps reach 240..the 335i engine is a looser....My e46 oil temps ran 212, you want just over 212 to run moisture out of oil. Even F1 engines turning 18 thousand RPM run just over 212, sorry you have been sold lemon engine, gear heads have know this for years and predicted problems, I know its hard to except, but it's true...sorry...

HS

your hatred of the english language is far harder to accept.

[Potty_Pants]

Originally Posted by Edward

Reading comprehension fail. don't read my post by the cover. You could assume that I know that the guage range isn't indicative of appropriate temperature to a T.

I was mentioning that it is not "way over" normal operating temps. I bet almost everyone here with a 335 runs low to mid 200s. If you are able to keep it below 200 constantly, you are driving in freezing temps below 3000 rpms. I know that just because they chose 250 to be the center point, it doesn't mean that it's the perfect temp to be at. They merely did this to make us feel like mid point is where our engines should be.

no reason to argue the point or go into symantics. On another topic ... we have people who live in FL (or hot states) with the N54 during the summer having their cars stay at 220... yet in cooler areas like NJ the temps stay around 240-250. My car has the oil cooler the one(s) in reference might not have. However it does seem to be a factual statement most N54's run around 240-250. With my limited automotive knowledge 240-250 is high and should be lower. Adding synthetic and 7 liters to the oil pan doesnt polish a turd... not that the twin turbo i still rave about is a turd... just the HPFP. perhaps my understanding of a TT engine using oil cooling of the turbos is incorrect and should run as hot as it does ?

The engine runs hot for a reason and overheats (under spirited driving) for a reason. BMW didnt design this N54 adequately. Im sure we can all pick at it say... oil dipstick, hpfp, high temps, wastegates, engine rattle, oil in intercooler,carbon build up,plug changes 40k etc.

ppp

[anerbe]

only real way to tell if the oil temps seen are appropriate is to understand the flow path of the oil and where the temp reading is being taken from. Oil 250+ entering the engine may be a problem long term. 250+ entering the turbos could also be a problem. 250+ right before the oil cooler may not be as bad if the oil enters in the engine at only 180-190C. Remember - with turbocharged engines, there is added heat rejection to the oil from the turbos. the oil will get hotter than a N/A engine. the biggest concern should be what temp is entering the engine. the oil properties themselves, being synthetic, should not be affected too much by these "higher temps"

Exerpt from Mobil One's website:
Mobil 1 Hot Temperature Properties

So what value is this at high temperatures? At high temperatures the oil molecule in synthetic oils are far more stable and degenerate less. This means not only do synthetic oils maintain lubrication integrity, they continue to cool and clean engine components at constant temperatures of up to 180°C, and can handle short term temperatures in excess of 200°C.

[lastMleft]

Originally Posted by Edward

I'm sure everyone here with an N54/N55 agrees that they were sold a lemon engine. GTFO. You can't even spell "loser" like an educated man.

Captain Edward, not all N54/N55 have these problems