Had thermostat issues, got sorted out less than 12000 miles ago, Now got a strange one. Oil temp goes up to 90-100c. Coolant sometimes goes up as normal sometimes not. Just did a 20 mile journey, and the rad is cold! Heater is hot as it should be. Top hose is hot and bottom hose still cold. Any ideas? Btw I have done a complete egr delete. Wouldn't have that much effect would it? Thanks.