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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 07-23-2011, 07:21 AM   #1 (permalink)
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520i missing coolant?

Hi guys, some advise please...
The wife's 1998 E39 M52 520i has lost it's coolant.
The wife was idling waiting for a friend and the coolant disappeared
I've checked all the hoses and there's no leak
I've refilled the coolant and it's not leaking nor is any escaping
I've checked the oil and it's light brown and very watery thin
I suspect the coolant has leaked into the engine oil via the head gasket
Does this sound about right?

Also I take it that's it not a good idea to drive while there's coolant in the engine oil as this will increase the temperature of the engine and is likely to cause cracks and increase costs further, as an interim stop gap could I replace the oil with some new oil without coolant and see if this holds the oil and not coolant? Could it be driven like this and check the coolant daily? The wife only uses the car for frequent short daily trips.

Obviously this is a drastic and expensive repair assuming it is the head gasket and am looking for any further advise for things to check before we part with the time & cash on getting this repaired. (or it could be cheaper to chop the car in px for a similar car than paying for a new head gasket?) many thoughts and your advise would be greatly appreciated thanks guys!

Regards,
Rob
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Old 07-31-2011, 11:31 PM   #2 (permalink)
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Whopp whoop

My first post LOL.. Yah you have a leak some where. Head gasket crack head or block.
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Old 08-01-2011, 02:58 AM   #3 (permalink)
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For a day after i had it fixed the temperature needle stayed in the middle but now its started to overheat again.
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Old 08-01-2011, 07:02 AM   #4 (permalink)
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oh dear it looks like the head gasket a
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Old 08-03-2011, 12:52 AM   #5 (permalink)
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Originally Posted by jimmythepie View Post
oh dear it looks like the head gasket a

Goodness that is a very restrained comment!
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Old 08-03-2011, 12:22 PM   #6 (permalink)
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good to see your still with us Penngwyne,hows that old mitsi of yours?
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Old 08-04-2011, 10:57 AM   #7 (permalink)
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good to see your still with us Penngwyne,hows that old mitsi of yours?
It died again.

I have been expecting it
Luckily it was in my drive and not halfway to somewhere far, far away.

Seems the ECU has packed it in. ECU is currently in Melbourne getting repaired and I am borrowing wife's Avalon and Son's 525 when needed and available.

It's been a week and I am getting withdrawal symptoms.
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Old 08-04-2011, 05:32 PM   #8 (permalink)
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Bad luck,hope it clears up soon.Whats an Avalon?
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Old 08-05-2011, 10:41 AM   #9 (permalink)
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Bad luck,hope it clears up soon.Whats an Avalon?
Toyota Avalon.
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Old 08-06-2011, 09:11 AM   #10 (permalink)
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Originally Posted by r1bby View Post
Hi guys, some advise please...
The wife's 1998 E39 M52 520i has lost it's coolant.
The wife was idling waiting for a friend and the coolant disappeared
I've checked all the hoses and there's no leak
I've refilled the coolant and it's not leaking nor is any escaping
I've checked the oil and it's light brown and very watery thin
I suspect the coolant has leaked into the engine oil via the head gasket
Does this sound about right?

Also I take it that's it not a good idea to drive while there's coolant in the engine oil as this will increase the temperature of the engine and is likely to cause cracks and increase costs further, as an interim stop gap could I replace the oil with some new oil without coolant and see if this holds the oil and not coolant? Could it be driven like this and check the coolant daily? The wife only uses the car for frequent short daily trips.

Obviously this is a drastic and expensive repair assuming it is the head gasket and am looking for any further advise for things to check before we part with the time & cash on getting this repaired. (or it could be cheaper to chop the car in px for a similar car than paying for a new head gasket?) many thoughts and your advise would be greatly appreciated thanks guys!

Regards,
Rob
If the car loses the coolant quickly then you have a cylinder head issue, but otherwise, why not try a coolant "Sealer" like "K-Seal"? Google it...
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Old 08-08-2011, 04:18 PM   #11 (permalink)
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Thanks for your feedback 'k-seal' it is then! I'm going to replace the oil & add k-seal and jobs a good 'un! Irony is that once I topped the coolant back up again, it's not been leaking or going down, the odd few short mile journeys but mainly on the drive so I suspect that it's a tiny hole that when the car was idling it expanded large enough to leak into the engine oil. Running normally seems to be fine and the sealant is the cheapest quick fix alternative.

We was toying with two options, fix the car at 350 or buy a new car. Seems like we've managed to do the third option, fix the car for 50 and buy a new car for 500!

I am the proud new owner of an E36 528 1992 with LPG kit, this shall save me circa 1500 PA going from my E39 525tds and the wife will have my car and we'll sell her 520i, just don't tell anyone about the k-seal )
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Old 08-09-2011, 04:00 AM   #12 (permalink)
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way to go
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Old 08-09-2011, 04:41 PM   #13 (permalink)
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Slight amendment, it's a 325 not 328 and it's gonna save me around 1k pa, not 1.5k pa, small but costly differences if you're thinking about ever going lpg...

Still not happy about losing my e39 (
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Old 08-09-2011, 04:47 PM   #14 (permalink)
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Slight amendment, it's a 325 not 328 and it's gonna save me around 1k pa, not 1.5k pa, small but costly differences if you're thinking about ever going lpg...

Still not happy about giving up my e39 (
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Old 08-09-2011, 07:27 PM   #15 (permalink)
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Still not happy about giving up my e39 ([/QUOTE]

Well keep it as a project and do things to it
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