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      12-11-2010, 12:55 AM   #1
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DIY Oil Cooler under $250 !!!!

Ok i came up with this project after seeing the pricing for the oil cooler kits that are out on the market for our cars , and unlike some people i just did not want to put 900-1k into a oil cooler because i knew it could be done for less. This will not be a mile long , short and to the point !!! So on to the good stuff ,

Step 1: purchase the parts depending on where and how you want to mount it will determine the fittings ie: straight 90 degree , 45 degree and so on , and obviously the length of your lines. You can use steel braided or the ultra light black or plain rubber , it is your choice it will be close to $10 a foot. The size core you choose will also be your choice i used a 11 by 4 1/2 Earls super cool core. If you have a 335i you will have to make custom adapter fittings to tap into the oem housing purchase the oem plugs and 2 STAINLESS steel 90 degree -8 and cut the pipe end threads off , drill the oem plugs out to 3/8 inch and tig weld the fittings together all fittings and lines used are -8. Note
if this is a 335 application and not a 135 the custom fittings need to be clocked so that they are facing the drivers side of the car for clearance for the hood

Step 2: remove the cowl and the engine cover , next you will have to remove the oil thermostat remove the top t-stat housing bolt so the cover can be removed pull the t-stat and spring out and reinstall the t-stat cover and the housing bolt. once that is done the engine cover and cowl can also be reinstalled . next mount your cooler again location is your preference , obviously somewhere there is air flow !! run your lines and fittings! and make sure they are tight you do not want a leak !!


Below are a few photos of the install the one with my finger in it is the T-stat housing cover that need to be removed in the last photo you can see the t-stat and the spring . If there are any questions regarding this PM me and ill get back to you , like i said it is not super in depth ! Have fun .
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      12-11-2010, 04:37 PM   #2
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so you removed the oil t-stat?
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      12-11-2010, 09:28 PM   #3
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If you have a 335i you will have to make custom adapter fittings to tap into the oem housing purchase the oem plugs and 2 STAINLESS steel 90 degree -8 and cut the pipe end threads off , drill the oem plugs out to 3/8 inch and tig weld the fittings together

pretty easy
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      12-11-2010, 09:29 PM   #4
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Quote:
Originally Posted by MteK View Post
If you have a 335i you will have to make custom adapter fittings to tap into the oem housing purchase the oem plugs and 2 STAINLESS steel 90 degree -8 and cut the pipe end threads off , drill the oem plugs out to 3/8 inch and tig weld the fittings together

pretty easy
unless you're using a $50 core this is going to be more then 250
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      12-11-2010, 10:53 PM   #5
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Quote:
Originally Posted by MteK View Post
unless you're using a $50 core this is going to be more then 250
the core was 110 the line was 35 the -8 straight *3 were 30 and the 90 degree was 25 and the custom fittings were 40 so that = 240 which is under 250 !!!
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      12-11-2010, 10:56 PM   #6
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Quote:
Originally Posted by MteK View Post
If you have a 335i you will have to make custom adapter fittings to tap into the oem housing purchase the oem plugs and 2 STAINLESS steel 90 degree -8 and cut the pipe end threads off , drill the oem plugs out to 3/8 inch and tig weld the fittings together

pretty easy
yes easy get the dremel out and hack off one side of the fitting and drill the oem plug out and weld them together obviously if you didn't have any mechanical skill you wouldn't attempt it for someone who does its not that bad
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      12-12-2010, 01:37 AM   #7
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So you pulled out the thermostat spring? Which means the oil will constantly be flowing thru the coolers correct? This means your car will never warm up correctly esp. in the winter. And since the oil will be running much much cooler it will be a completely different viscosity. I would plan on figuring out what viscosity you need b/c that engine is designed to run with a certain oil viscosity, which is determined by the normal operating temps(210-230). Which you have altered probably by a large margin.
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      12-12-2010, 03:00 AM   #8
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Quote:
Originally Posted by Bakeme521 View Post
So you pulled out the thermostat spring? Which means the oil will constantly be flowing thru the coolers correct? This means your car will never warm up correctly esp. in the winter. And since the oil will be running much much cooler it will be a completely different viscosity. I would plan on figuring out what viscosity you need b/c that engine is designed to run with a certain oil viscosity, which is determined by the normal operating temps(210-230). Which you have altered probably by a large margin.
actually as of rite now it warms up the same time if not quicker and it does not cut enough temp that it will affect in that manor if the car is driven really hard it still can reach the high operating temps but when driven normally the temp will drop faster than with just the oem cooler in place , the operating temps are not below 210 , only while warming up. the drop is only around 30 degrees
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      12-12-2010, 03:37 AM   #9
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Quote:
Originally Posted by taylors335 View Post
actually as of rite now it warms up the same time if not quicker and it does not cut enough temp that it will affect in that manor if the car is driven really hard it still can reach the high operating temps but when driven normally the temp will drop faster than with just the oem cooler in place , the operating temps are not below 210 , only while warming up. the drop is only around 30 degrees
So what is the temp when just driving down the highway after warmed up?
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      12-12-2010, 04:44 PM   #10
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just cruising not stepping on it around 210/220
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      12-13-2010, 01:38 PM   #11
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when removing the T-stat and spring, does it just come out or did you have to hack it up to remove it?
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      12-13-2010, 01:54 PM   #12
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So you took out the T-stat completely?
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      12-13-2010, 03:35 PM   #13
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it pulls rite out !!!
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      12-14-2010, 10:14 PM   #14
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Very nice. If I didn't already have the stock oil cooler (that happens to work fine on my 07 335) I'd be doing this.

Just watch out for temps being too low. Single digits this morning, below ZERO tonight.
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      06-18-2011, 01:48 AM   #15
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Quote:
Originally Posted by guidance View Post
Very nice. If I didn't already have the stock oil cooler (that happens to work fine on my 07 335) I'd be doing this.

Just watch out for temps being too low. Single digits this morning, below ZERO tonight.
obvoiusly not a place you would want to run the spring'less setup
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      06-20-2011, 08:37 PM   #16
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Did your car have a stock oil cooler?
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      07-03-2011, 01:41 AM   #17
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Did your car have a stock oil cooler?
yes and still in use with the added cooler
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      07-03-2011, 01:42 AM   #18
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Quote:
Originally Posted by guidance View Post
Very nice. If I didn't already have the stock oil cooler (that happens to work fine on my 07 335) I'd be doing this.

Just watch out for temps being too low. Single digits this morning, below ZERO tonight.
dude i live in san diego ive never felt "single digit" temps in my life !!!
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      07-03-2011, 10:24 AM   #19
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oil cooler < $250

Finally someone that doesn't need to ask "what should I buy for my BMW" and with a little skill.
Good write up.
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      07-03-2011, 05:30 PM   #20
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Taylor335,
You are very close to duplicating a $800 kit on the market presently. You could take this a bit further and make a block off plate and adapter, or just use the stock thermostat housing, gutted like yours and source a thermostat from Earl's or Summit (Summit has a better selection of heat ranges). Matter of fact if you don't mind I will copying yours. Not patented is it.
Again great idea.
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      07-08-2011, 04:28 PM   #21
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Taylor335,
You are very close to duplicating a $800 kit on the market presently. You could take this a bit further and make a block off plate and adapter, or just use the stock thermostat housing, gutted like yours and source a thermostat from Earl's or Summit (Summit has a better selection of heat ranges). Matter of fact if you don't mind I will copying yours. Not patented is it.
Again great idea.
not yet
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      08-30-2011, 01:10 PM   #22
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So what would be the result of leaving the thermostat spring installed?
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