Oil in coolant - Head gasket?
I've had a few cooling issues recently:
History:
• Fitted a big radiator with 1.3 bar cap (secondhand) around 10k miles ago - Haven't changed fluid since.
• Topped up due to getting hot - Put it down to not having much water.
• I've just got back from a 500 mile round trip (Including a track session), 400 miles in car got hot again so topped up. Was fine the rest of the trip.
Symptoms:
• Dirty coolant - Oil residue in bucket but no oil separation in water.
• Crystallised/ hard bits in pipe work
• Oil residue on cap and thermostat
• Using oil - I assume this is because its going into the cooling system!
For the record, there's no white smoke or mayo in the head or breathers.
I assume this is head gasket related? Or is there anything else it could be?