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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 03-02-2015, 11:12 AM
CFP2 CFP2 is offline
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Thermostat and oil cooler

Ok so I checked my passenger wheel and I do have vents yes but under my hood I have no thermostat what does this mean ? Is it bad ? I been doing my best too lower oil temps as I live in south Florida the hot an humid state and if so should I buy one ?
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  #2  
Old 03-02-2015, 11:13 AM
CFP2 CFP2 is offline
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2011 335i coupe
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  #3  
Old 03-02-2015, 11:23 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Originally Posted by CFP2 View Post
Ok so I checked my passenger wheel and I do have vents yes but under my hood I have no thermostat what does this mean ? Is it bad ? I been doing my best too lower oil temps as I live in south Florida the hot an humid state and if so should I buy one ?
Set your Google to N54 oil filter housing thermostat

Or N55....
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  #4  
Old 03-02-2015, 01:13 PM
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Zooks527 Zooks527 is offline
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If it's a 2011 335i coupe, it has the oil cooler if it isn't an xDrive. If it has the vents in the wheel well, it has an oil cooler. Are you sure you know what you're looking for regarding the thermostat?

Either way, unless you're tracking it, don't worry about it. My 2009 does not have the oil cooler, and I've never had an issue, even at 106F and highway speeds.
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Prior 34 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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  #5  
Old 03-02-2015, 01:14 PM
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Originally Posted by zooks527 View Post
if it's a 2011 335i coupe, it has the oil cooler if it isn't an xdrive. If it has the vents in the wheel well, it has an oil cooler. Are you sure you know what you're looking for regarding the thermostat?

Either way, unless you're tracking it, don't worry about it. My 2009 does not have the oil cooler, and i've never had an issue, even at 106f and highway speeds.

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  #6  
Old 03-02-2015, 01:59 PM
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Huh, you don't. That's interesting. You said it's a coupe, and I'm assuming RWD, not xDrive. Did you buy it new or used?

I still wouldn't worry about it. If you're not tracking it, you shouldn't need it, regardless of how warm it gets down there.


EDIT: Well, look at that. I pulled the 2011 build specs, and the oil cooler on the coupe only came with the 840 increased speed option (which added the cooler) if you ordered one of the sport packages. Before that, it was standard.

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Prior 34 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion

Last edited by Zooks527; 03-02-2015 at 02:09 PM.
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  #7  
Old 03-02-2015, 02:06 PM
CFP2 CFP2 is offline
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Originally Posted by Zooks527 View Post
Huh, you don't. That's interesting. You said it's a coupe, and I'm assuming RWD, not xDrive. Did you buy it new or used?

I still wouldn't worry about it. If you're not tracking it, you shouldn't need it, regardless of how warm it gets down there.

RWD got it 2 months ago with 29,000 miles great deal for an 11 and it is a coupe. I plan on FBO but not Gana track it just drag now an the.
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Old 03-02-2015, 02:13 PM
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OK, so at a guess you have 17" A/S tires all the way around, non-staggered. Those would delete the high speed option, and yank the cooler with it.

That wasn't an option earlier. Must have been demand for non-sport versions, and they changed the base equipment set.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 34 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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Old 03-02-2015, 02:18 PM
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Originally Posted by Zooks527 View Post
OK, so at a guess you have 17" A/S tires all the way around, non-staggered. Those would delete the high speed option, and yank the cooler with it.

That wasn't an option earlier. Must have been demand for non-sport versions, and they changed the base equipment set.

Dame you must really know your stuff lol I have 17" yea but idk what A/S or staggered means I just know I got a new set non run flat Michelin SS. So does it help lower oil temp ? My oil temp never passes 240 but I wouldn't mind lower
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Old 03-02-2015, 02:32 PM
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Originally Posted by CFP2 View Post
My oil temp never passes 240 but I wouldn't mind lower
Yes you would - or rather, your engine would. They are designed to run fairly hot for efficiency; 240F is normal. Even with the cooler, you will see the same temperature range most of the time because the cooler is thermostatically regulated to about that point. The ECU will manage the cooling to keep the engine near that temperature regardless of whether you have the auxiliary cooler or not.

If you are never seeing oil temps above 240F you are not stressing the car hard enough to need or worry about the aux cooler.
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Old 03-02-2015, 02:38 PM
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Originally Posted by Zeichen311 View Post
Yes you would - or rather, your engine would. They are designed to run fairly hot for efficiency; 240F is normal. Even with the cooler, you will see the same temperature range most of the time because the cooler is thermostatically regulated to about that point. The ECU will manage the cooling to keep the engine near that temperature regardless of whether you have the auxiliary cooler or not.



If you are never seeing oil temps above 240F you are not stressing the car hard enough to need or worry about the aux cooler.

Ahahha I would but I got 2 speeding tickets my first weekend with the car and I don't drive a lot cause I get rides save milage but I plan on FBO and thrashing it so just wanna know should I add it too list of future installs
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Old 03-02-2015, 02:40 PM
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Originally Posted by Zooks527 View Post
That wasn't an option earlier. Must have been demand for non-sport versions, and they changed the base equipment set.
My money is on the change from the N54 to the N55 engine at SOP for MY2011 (3/10 for coupes, 9/10 for sedans). Before that, IIRC it was as you said, with all RWD coupes (and sport-package-equipped sedans) getting the aux cooler after the early complaints and confusion on that topic. The switch from a biturbo to twin-scroll design, plus all the other mechanical changes, probably returned the cooler to non-essential status for cars with the lower top-speed limiter.
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  #13  
Old 03-02-2015, 02:56 PM
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Zooks527 Zooks527 is offline
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Originally Posted by CFP2 View Post
Dame you must really know your stuff lol I have 17" yea but idk what A/S or staggered means I just know I got a new set non run flat Michelin SS. So does it help lower oil temp ? My oil temp never passes 240 but I wouldn't mind lower
A/S = all-season tires. Non-staggered means that the front and rear tires are the same size / width.

Now, the last owner could have dumped the all-seasons for summer tires and gone with wider rears than fronts, but since you don't have the cooler, your car was delivered with 17" all-season tires, with the same size tires on all 4 wheels.

As Zeichen says, the engine is designed to run best at 240. The extra oil cooler won't open if the temperature is below that point. You can add anything you want (it's your car, after all), but unless you start seeing temperatures over 250F consistently, adding the oil cooler is just dumping money for no good purpose.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 34 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion

Last edited by Zooks527; 03-02-2015 at 02:58 PM.
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  #14  
Old 03-02-2015, 03:08 PM
CFP2 CFP2 is offline
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Originally Posted by Zooks527 View Post
A/S = all-season tires. Non-staggered means that the front and rear tires are the same size / width.

Now, the last owner could have dumped the all-seasons for summer tires and gone with wider rears than fronts, but since you don't have the cooler, your car was delivered with 17" all-season tires, with the same size tires on all 4 wheels.

As Zeichen says, the engine is designed to run best at 240. The extra oil cooler won't open if the temperature is below that point. You can add anything you want (it's your car, after all), but unless you start seeing temperatures over 250F consistently, adding the oil cooler is just dumping money for no good purpose.

Awesome answer I will keep that in mind I don't want too waste money on something I don't need of course but if I ever do see it over 250 I'll look into getting one and summer is here and in Miami that means hot an humid lol but thank you
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Old 03-03-2015, 07:37 PM
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You need to go north of 270F to get the engine into limp mode. I added the cooler to my car simply because I live in Florida but frankly it was not needed. Peace of mind is what it provides. I did see 265F in Europe but that was at 145 mph on the Autobahn not to be repeated in this country.
You should be fine unless you really beat on the car by tracking it...
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Old Yesterday, 08:57 PM
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How much for installing the oil cooler on 2011 335xi...? Any idea..? I live in CT .. Use Mobil 1 5-30.. Should I ..?
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Old Today, 03:18 AM
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Zooks527 Zooks527 is offline
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Originally Posted by cazzopazzo View Post
How much for installing the oil cooler on 2011 335xi...? Any idea..? I live in CT .. Use Mobil 1 5-30.. Should I ..?
OEM will be a few thousand dollars. I wouldn't bother.

Most Mobil 1 oils don't meet the BMW LL-01 requirement. Find the Mobil 1 that does (I think it's the 0W-40 96989), or use another that meets the BMW spec (Castrol's OEM BMW oil, Castrol 06244 Edge, as well as Valvoline or Total oils that meet it).
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 34 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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Old Today, 04:31 PM
cazzopazzo cazzopazzo is offline
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Thank you Zook .. The dealer told me to use 5-30 .. I do mine every 5k miles is that ok ? And every 10k the dealer on warranty.. Please advise ..
Ty!
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Old Today, 07:01 PM
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Zooks527 Zooks527 is offline
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Originally Posted by cazzopazzo View Post
Thank you Zook .. The dealer told me to use 5-30 .. I do mine every 5k miles is that ok ? And every 10k the dealer on warranty.. Please advise ..
Ty!
To be honest, 5k seems like overkill. I do mine every 7500 (my car doesn't ask for it until it's up around 18k - 20k). But you won't hurt anything doing every 5k. Except perhaps your wallet.
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ED May 12, 2009, Munich dropoff May 16, Redelivery June 22, 2009




Prior 34 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette (kept until first Bronco) / 1981 Subaru GL wagon AWD / 1983 s10 Blazer 4x4 (big mistake) / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion
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