2007 750 Li - Put engine oil in coolant slot!! - Bimmerfest - BMW Forums



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Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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Old 06-11-2016, 07:26 PM
kabirsawhney kabirsawhney is offline
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2007 750 Li - Put engine oil in coolant slot!!

Hello - I goofed up big time and ended up putting my engine oil in the coolant slot of my 2007 750Li. I didn't realize until almost a week and have been using the car sporadically since then without any issues. I'm going to my dealer this coming week to get this sorted but wanted to see if anyone has any thoughts on what short term and long term damage I may have caused already.

Please help. I feel stupid enough already! Thanks!
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Old 06-12-2016, 07:22 PM
jermariolc jermariolc is offline
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Wow!!!
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Old 06-12-2016, 07:24 PM
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the cooling system is gycol and distilled water so you've just added some oil to it. Good news is that there shouldn't be any damage short term or long term.

You are going to have to flush out the cooling system 2-3 times to ensure all the oil is out. Pretty much drain the cooling system and refill unless you can find a shop that has a cleaning machine.

A good independent mechanic or yourself can do it easily, take your time and use the BLUE BMW coolant and Distilled water.
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Old 06-12-2016, 07:38 PM
kabirsawhney kabirsawhney is offline
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Thanks @csmeance for the useful advice!
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Old 06-13-2016, 03:40 AM
mathat mathat is offline
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would have thought it would be hard to get it all out - probably best to drain the water a couple of times and flush with a hose and then remove the cap while hot (very carefully as you will get burnt by the hot water if you don't know what you are doing) just to get the last of the floating oil residue out!
I doubt if a shop will be that good at cleaning it through unless you have a very good shop - but obviously you won't do this your-self as you don't even know where to put the oil.
- anyway the oil in the water would not have done any damage to the engine - unfortunately driving the car with little oil in the engine might have! (hopefully it did not urgently need oil - or perhaps you were doing the yearly oil change!)
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Old 06-13-2016, 05:27 AM
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I'd be more worried about the low engine oil level; oil in the coolant isn't a big short term problem (it can reduce cooling efficiency over time with sludge build-up in the system though).
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Old 06-13-2016, 09:55 AM
kabirsawhney kabirsawhney is offline
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Thanks guys! I have been getting an oil change every 10/15k miles and also refilling the oil regularly so that's not an issue. Going to the shop today to get the coolant drained and cleaned. Thanks for all the comments!
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Old 06-21-2016, 10:43 PM
kabirsawhney kabirsawhney is offline
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Quick update on this fix - got the car back from the service shop today after one day and cost me $433 (two hours of labor and parts). They had to drain and flush the coolant reservoir twice. Also, there was no damage done to the engine, thermostat etc.
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Old 07-02-2019, 01:23 PM
750liwsj 750liwsj is offline
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I did this today also but only put a quarter in

Shop is flushing it now. If you do this the oil usually sits on top and you can siphon it out but I drove it before i realized that. How can you know if all the oil is out of the radiator?
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Old 07-02-2019, 01:50 PM
Autoputzer Autoputzer is online now
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Back in the 1970's some car manufacturers put a little bit of engine oil in the cooling system at the factory to prevent corrosion when the new cars ended up sitting for months before being sold. But, it was discovered that a thin film of oil in the inside of the radiator tubes greatly reduced the radiators' cooling capacity.

I now somebody who'd daughter "filled up the radiator" with coolant via the oil fill hole. That was much worse than what you did.
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