Question about BMW 750

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I found some oil in the water of the rediator , and the mechanical change the gasket and still the same problem

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You may be looking at OLD TRANSMISSION FLUID that has turned brown. This problem is normally associated with the Transmission Cooling tank leaking into the cooling system, there is not enough information in your write up to be 100 percent sure but I have had this same problem with a 328i

If it is OIL, then you are looking at a blown head gasket or a crack in the head or block. There are a few other ways to get oil in the system but I would start with troubleshooting the Radiator in a Tank and then see if there is air bubbles coming out of the Transmission fittings. This is going to be your first clue your radiator tank is leaking.

Good luck

Posted on May 29, 2011

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The engine and the automatic transmission can both be sources of oil in the radiator.The automatic transmission fluid is cooled in the radiator and a leaking cooler can cause oil in the radiator as well as a blown head gasket or a cracked engine block.Most of the time it is a simple head gasket issue, and the radiator must be flushed with soap to remove all the oil from the cooling system.I suspect the oil you see is residual if you have no other symptoms.

Posted on May 29, 2011

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