Cheers everyone for great feedback. I'm only wary because this is engine was only recently fitted due to the hydro shock problem i had. Checked it again today, no new gunge build up in filler cap and oil is really clean, water is clear also with no bubbles or smell of exhaust fumes coming from water filler bottle, radiator is spotless inside also. Plus no sweet smell from exhaust that could suggest burning antifreeze. So going to go for a good long drive out tonight Once the weather changes for the better ill do a full re service, it's has only just passed a MOT so it should keep on motoring for yonks and yonks. By the way it only failed on a front wheel bearing that only cost me 20 odd quid to put right, Damn I love Toyota's