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I just purchased thermostats for my petrol and diesel and they sold me the same one for both 4.2 engines. Haven't checked if they fit yet.
My TD42 just spent every hill from VIC to coffs sitting on 3/4 temp (bout where the fan kicks in)
And EGT's of 500/550 so I will be seriously looking into the 3 core rad next time , never got the car this hot in the Simpson and Kimberly .
I did remove and clean radiator before trip and it was covered with mud just from the 2 trips to matts so I don't see mud clogging a 3 core as any more of a problem