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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-18-2012, 07:20 AM   #1
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Join Date: Oct 2012
Location: Vermont
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My Ride: 2003 BMW 325xi Sedan
03 325xi RED oil light

Has anyone found the exact cure for the blinking RED oil light on the 3 series 2.5 L6...this is the RED oil pressure light...NOT the yellow oil level light (as they seem to get confused sometimes)...while researching (these forums and the web) it seems to be a common problem and best answer I've found is the oil pressure switch by the oil filter...just curious if anyone has ran into this problem and fixed it...oil pressure switch is about 10 or 15 bucks...not a big deal to install a new one...just curious if this has actually fixed the issue for anyone?
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Old 11-25-2012, 01:16 PM   #2
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CuZz0, I changed the pressure switch and it fixed the problem for me.
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Old 11-26-2012, 12:16 AM   #3
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Originally Posted by pmagloir View Post
CuZz0, I changed the pressure switch and it fixed the problem for me.
Same thing here, i ordered the switch for like $8.
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Old 07-04-2013, 05:36 PM   #4
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My Ride: 2003 BMW 325xi Sedan
Bought the car from a used car dealer I used to sell parts to. I knew they put 5w30 "house brand" full synthetic oil and a Bosch Distance Plus oil filter in it because I sold it to them. Did my own first oil change on this car about two months ago. Used a Mann oil filter, 7 quarts of Castrol 5w40 synthetic and a quart of Lucas oil stablizer (one of the few additives I recommend, been using it in all my rigs for the last 10 years. The only product that all but eliminates general motors 100,000 mile valve train noise on start up and does the same for dry starts in any car). No more oil light when she's hot, and she's been through multiple 90 degree days. I would not rule out the oil pressure switch in most cases, but in mine, that was not the issue. If you have the flashing red oil light, I would recommend changing the oil first with the proper grade and filter (although I will not knock bosch oil filters...I think in my case it was the oil grade, and the lucas helped because @130000+ there is no way the stock oil pump is as healthy as she once was. Also, the e46 is a cartridge...you can basically see it's filtration quality by looking at it{1}), and if that doesn't work install a new oil pressure switch. If you still have the light after a new switch and are running to the correct lubrication specs, then your car is not making the oil pressure due to an internal problem (be it a faulty pump, worn journals, faulty rings etc.). Time for a rebuild or trade in.

{1}If you use a canister (metal housing filter) on your make of car, the best comparison for quality between brands in my opinion is it's weight, the heavier the filter, the more paper...the heavier weights will more than likely not be from more metal for the housing because that carries the highest production costs

Last edited by CuZzO; 07-04-2013 at 05:45 PM. Reason: proof reading
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