Whats causing the mustard look on my oil cap just bought the car 3 months ago?

and it was like that look when i bought now i have found other problems over the months which was like it at the time i got the car its a clio rn 1.2 hole in the back box. no temp gauge stays still does not rise spoke to dealer still waiting for repairWhats causing the mustard look on my oil cap just bought the car 3 months ago?
usually its the start showing water is getting in.Whats causing the mustard look on my oil cap just bought the car 3 months ago?
I think you have water mixed in your oil have it check to a garage.
hi i would get the garage to check ,sounds like water ,garage should have noticed this when doing pre sale check


this can happen also when the car is left sitting a while (garage forecourt)


as for the other things get it back to the dealer demand them to be fixed soon or you want your money back
TAKE IT TO A GARAGE AND ASK THEM IF THEY CAN DO A HEAD GASKET CHECK. IT SOUNDS LIKE YOUR HEAD GASKET MIGHT BE ON ITS WAY OUT.
Just as a reassurance, it may not be the head gasket. The ';mayonnaise'; under the filler cap can form if the engine is not warming up properly, which tallies with the temp gauge not rising. May just be the thermostat.
It's an emulsion of oil and water. Clean it out and see if it forms again. If it does, and the oil on the dip stick is grey, you've got water in the oil. That could mean a new head gasket. If it doesn't come back and the oil on the dip stick is clear, it's was caused by condensation because the car had been standing in the cold for a long time.
you get this if you are only doing short runs as the engine does not get time to warm up.it is also a sign that the breather is blocked or the engine is worn.
If the car has been only used for short stop start drives, then its probable that condensate has formed in the engine. Get a good oil change service and every now and again take the car for a long drive.


Ja.
Have an oil and filter change, use a flushing oil before refilling to get all the goo out. Then do a compression test to check out the head gasket, and replace if necessary. Not as big a job as it may sound.





Good luck.
take the car for a long fast drive once a week make sure it gets warm that should cure it.
either you do a lot of short trip driving or you have a intake or head gasket leaking, do you notice your antifreeze level going down any?, also might help to replace the PCV valve.
Oh no bad news, you could have a crack or a leak somewhere, that is water and oil mixing.


Also check the thermostat.





Always open that up and check for scum, didn't your dad teach you that one?
it would help if we could get year make n model could b condensation or blown head gasket cracked head some vehickles have plastic valve covers creates more condensation than metalones