Question about 2005 Renault Megane

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Oil in water tank

Purchased car 3 weeks agao. topped up water and have found oil in water tank? car is not overheating and running normal.

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Oil is entering water system via a small leak in the head gasket adjacent to the oil drilling where the oil comes from the pump through the head gasket up to the head itself to lubricate the camshaft / valve gear. Or, there is a problem with the oil cooler found on a lot of Renaults. If you look at the oil filter there may be a metal donut looking piece with 2 x 3/4 water hoses attached to it. Because the oil pressure is 40+ lbs and the water is 14lbs when running, and if the cooler has an internal leak / fracture, the oil will gradually pass to the water jacket by virtue of the greater pressure.
Disconnect the 2 hoses and join the 2 block ends together with a length of hose, refill the coolant, run the engine for a while and see if there is any trace of oil or bubbles coming from the now open oil cooler stubs. If there is then the cooler is leaking internally. Replacement is the only option. The biggest problem you face is that the engine block, radiator, heater matrix are all carrying the oil sludge that's been circulating the water system. Cleaning all that out successfully may be your biggest quest.
How do I know all this, I'm just doing the same job on a Renault Clio diesel!!
Get some quality help, prepare yourself for changing the head gasket, timing belt etc. I'm going to flush mine with a strong detergent mix on reassembly, running a garden hose into the upper rad stub and allowing the lower to vent out and hope it brings most with it. Only a hot washer would help and I've bought a new header tank from online to replace the discoloured one when there's no gunk left. Good luck.

Posted on Apr 19, 2014

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Posted on Jan 02, 2017

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