Not sure if Head Gasket

[gor131-x]

ive put a new engine and all the parts and now the cars runnin fine its nt heatin up its nt that bad on fuel for a 1.4 in £47 im gettin like 270miles but its drinking alot of water and theres alot of mayo under the oil cap and i mean alot when you pull it off it drips of it and the oil a month ago was half now its wel over the max i think its water but i just wanna kno is it defo the head gasket and not some other seals im probs wrong but say of the manifol or exhaust or nethin lyk that

[Horney]

What car?

The oil and water are deffo mixing though so you need to find where. Could be the oil cooler if your car has one fitted.

If you can do a compression check.

nick

[gor131-x]

hi its a mk3 golf 1.4aex engine i think

[burnt01]

A blowen head gasket would give you the water oil mix and kill your mpg.  To loose both without a leak it would be your head gasket, as in all fluid is going out the exhaust

[danny_p]

but a blowing head gasket dosent normaly let you drive round for a month before fullly developing

[burnt01]

yeah missus one went over a long time, just more steam than normal before the final bellowing cloud, after that was sorted it's been fine for the past 2 years 
Also we went to get a friends polo and that head gasket had gone, loosing oil/water drove that 150 mile topping up every now and then. surprising how well it did before we canged at over because of inpending mot

Head gasket not that bad to cange over and means you can get the cam belt at the same time (think about water pump)