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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 08-25-2008, 11:13 AM
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Mk23 Mk23 is offline
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Dinan Oil Cooler

Is it worth buying a Dinan oil cooler to preserve the life of my engine? I plan on keeping the car for over 6 to 8 years. I might eventually get the stage 1 after I have gotten used to the stock power, but I am thinking of getting the oil cooler right away. Any thoughts?

- Mk
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  #2  
Old 08-25-2008, 11:19 AM
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Since you should be getting the stock cooler, and replacing it with the extra-big Dinan could be done anytime in the life of your car, I'd suggest you see how it runs as-is.
If you go Stage 1, check out what the recommendations are at that time, as there will be that much more experience with the e92s, factory equipped coolers.
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  #3  
Old 08-25-2008, 11:23 AM
anE934fun anE934fun is offline
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You should join the other oil cooler thread - it has already started devolving into whether the factory oil cooler is really needed or not....

On a serious note, it kind of depends on how much you want to obsess about your cars engine. Personally, I plan on finding the point (using oil analysis) where the oil starts to degrade (combination of viscosity deterioration and base number drop) and then replace the oil & filter on that schedule. I expect the magic number will be somewhere in the 7,000 mile (7,500 mile?) point. Unless you are planning on tracking the car, I really don't see the benefit of a larger oil cooler. You might be able to stretch another 500 - 1,000 miles out of the oil by running a larger oil cooler; you won't get a magical 7,000 miles. Given the installed cost of a Dinan oil cooler vs. the cost of more frequent oil & filter changes, it would seem that more frequent oil & filter changes are a better solution (less cost and the engine is better maintained).
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  #4  
Old 08-25-2008, 12:05 PM
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I'd say more frequent oil changes are better than an additional oil cooler. Especially if the Dinan oil cooler doesn't actually lower oil temps (as it relies on an electronically controlled thermostat).

- Mike
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  #5  
Old 08-25-2008, 12:25 PM
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Orient330iNYC Orient330iNYC is offline
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Quote:
Originally Posted by Emission View Post
I'd say more frequent oil changes are better than an additional oil cooler. Especially if the Dinan oil cooler doesn't actually lower oil temps (as it relies on an electronically controlled thermostat).

- Mike
+1

The stock oil cooler only has oil actually flowing through it when the oil temp goes above ~240F. so if you arent actually hitting the activation temp for the stock oil cooler, the dinan cooler will do nothing for you.
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  #6  
Old 08-25-2008, 03:48 PM
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Originally Posted by Orient330iNYC View Post
+1

The stock oil cooler only has oil actually flowing through it when the oil temp goes above ~240F. so if you arent actually hitting the activation temp for the stock oil cooler, the dinan cooler will do nothing for you.
yup.. that's pretty much the way to figure it out... if your average temp is around the 240 mark, Dinan won't do much except lighten up your wallet.
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  #7  
Old 08-25-2008, 07:03 PM
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Quote:
Originally Posted by Emission View Post
I'd say more frequent oil changes are better than an additional oil cooler. Especially if the Dinan oil cooler doesn't actually lower oil temps (as it relies on an electronically controlled thermostat).

- Mike
That sounds logical. Appreciate it guys.
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  #8  
Old 08-25-2008, 09:28 PM
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invariant invariant is offline
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Quote:
Originally Posted by Orient330iNYC View Post
+1

The stock oil cooler only has oil actually flowing through it when the oil temp goes above ~240F. so if you arent actually hitting the activation temp for the stock oil cooler, the dinan cooler will do nothing for you.
I heard that with Dinan flash one also gets remapped water pump control, so that water circulates faster and keeps engine cooler. I have always been wondering if one could get just that feature... I'd favor higher pump speeds and lower engine temperatures over the pump wear and slightly higher emissions.
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  #9  
Old 08-26-2008, 06:32 AM
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Orient330iNYC Orient330iNYC is offline
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Originally Posted by invariant View Post
I heard that with Dinan flash one also gets remapped water pump control, so that water circulates faster and keeps engine cooler. I have always been wondering if one could get just that feature... I'd favor higher pump speeds and lower engine temperatures over the pump wear and slightly higher emissions.
well, the price would be a voided *BMW* powertrain warranty...

replacement cost for the water pump is 500 + labor, guessing 1K total

I'm not sure that the dinan flash lowers the operating temp of the engine, i suspect it might increase cooling under high demand, not just in general.

I've yet to see anyone display any proof that the high engine temps are actually as detrimental as everyone seems to think. i have a strong feeling that the extended oil change intervals have more of a negative effect that the high operating temp.
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Last edited by Orient330iNYC; 08-26-2008 at 06:36 AM.
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  #10  
Old 08-26-2008, 08:58 AM
Sterling Sterling is offline
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Are you guys sure that the stock Oil Cooler does not kick in until oil temp hits 240

I thought it worked all the time
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  #11  
Old 08-26-2008, 10:34 AM
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Lost Horizon Lost Horizon is offline
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Originally Posted by Sterling View Post
Are you guys sure that the stock Oil Cooler does not kick in until oil temp hits 240

I thought it worked all the time
I'm sure. I have run mine without and with the stock oil cooler, it it's quite apparent that the thermostat regulation begins at 113C with the cooler installed which is 235F. Without the cooler, the temp just rises and falls above that, floating with the load in normal driving. With the cooler, it hangs around 235-240, unless you really dig into it to go past the capability of the system to hold the set point range.

It's the way you want it to work. Just as you don't want the oil too far above the design point, you don't want it too low either. Without the thermostat on a cold winter day, it could drag the oil temp down below design, or take the oil that much longer to warm up... also a wear problem.

Last edited by Lost Horizon; 08-26-2008 at 10:38 AM.
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  #12  
Old 08-26-2008, 10:41 AM
jelliotlevy jelliotlevy is offline
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Quote:
Originally Posted by Lost Horizon View Post
yup.. that's pretty much the way to figure it out... if your average temp is around the 240 mark, Dinan won't do much except lighten up your wallet.
.....

In fairness, nobody here is knocking the Dinan cooler. If you drive competitively at the track, it would seem worth having. If your normal driving style involves aggressively going up and down hill, hard braking and acceleration, all in lower gears at high rpm's, then it might also be worth having. If none of the above apply, then the factory auxiliary cooler will keep you below 240 essentially all the time, and that should be best for longevity. You might also ask yourself if you have higher priority uses for the two thousand bucks.
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  #13  
Old 08-26-2008, 02:26 PM
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fun2drive fun2drive is offline
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My car didn't have the cooler and my temps would hit 270F. However that was under high speed driving in Germany at an ambient temp of 50-55F. In the US I have seen 255F most of the time and decided that since I keep BMWs around 10-12 years getting the factory aux cooler installed was worth the cost. I can't comment so far to date because have not driven it that much on the interstate. From what I can tell the temp stays around 240F.
Still I came from a Supercharged 325 which never got above 210 and usually stayed at 180F.
I know from reading some SAE papers and some extended tests that the oil will handle the temps but what concerns me are the seals, hoses, other underhood components that are exposed to these higher temps.
Time will tell but I am doing oil changes at 7500 miles after an initial 2500 change.

Engines are expensive, oil is cheap and I am conservative...
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  #14  
Old 08-26-2008, 02:33 PM
amuro876 amuro876 is offline
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may i ask how much you pay for the oem oil cooler with installation? i am also without oil cooler.
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  #15  
Old 08-26-2008, 03:13 PM
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Lost Horizon Lost Horizon is offline
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Mine was approx 2,500 CDN back in 2007. There is a fair bag of parts to do it, and they have to change out the front wheel well liner as well as change the oil filter and housing. If you are without, the Dinan is most likely no more expensive, and a better cooler from ground zero.

Last edited by Lost Horizon; 08-26-2008 at 03:16 PM.
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  #16  
Old 08-26-2008, 03:33 PM
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g2artist g2artist is offline
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Quote:
Originally Posted by fun2drive View Post
My car didn't have the cooler and my temps would hit 270F. However that was under high speed driving in Germany at an ambient temp of 50-55F. In the US I have seen 255F most of the time and decided that since I keep BMWs around 10-12 years getting the factory aux cooler installed was worth the cost. I can't comment so far to date because have not driven it that much on the interstate. From what I can tell the temp stays around 240F.
Still I came from a Supercharged 325 which never got above 210 and usually stayed at 180F.
I know from reading some SAE papers and some extended tests that the oil will handle the temps but what concerns me are the seals, hoses, other underhood components that are exposed to these higher temps.
Time will tell but I am doing oil changes at 7500 miles after an initial 2500 change.

Engines are expensive, oil is cheap and I am conservative...
My thoughts exactly, the seals and hoses have gotta be taking a beating in that kind of heat.
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