1993 Jaguar XJ6 engine top end re-built year ago, oil still

Hi purfect,

Thank you for the donation.

Foaming of tan oil is a sign of water in oil. You might have a blown cylinder head gasket or bad head. This would cause excessive blowby gases resulting in the oil getting to the intake hose.

You should have shortage of coolant in the radiator and if driven over long distance the engine should be overheating.

You need to get it repaired asap to avoid additional damages to the engine.