90 running rough after pay n play day

defender89 said:

Yeah, trying to get rid of any moisture, it isn't going to hurt anything.

Click to expand...

Belts don't like mineral oils on them - it will cause them to perish. Use silicon spray.

WD40 is often used as a lubricant, it's made up mainly of kerosene with a little oil and only really works well as a light lubricant (locks, hinges) and driving moisture out of some things, but it's also a solvent by nature because of the high kero content. Be careful with this stuff.

i would have got the infra red thermonitor point at the hoses and radiator to look for cold spots and very high spots that way you will know if the
A. the water is circulating
B. if part of the rad knackered
C. if the thermostat is opening

By the sounds of things i am thinking head gasket or water pump failure.
When its cold remove the expansion tank cap give the engine a good rev if the water pump is pumping you will see water being pumped in to the tank to be recirculated, If not water pump knackerd.