when i first got my valver the oil temp never used to go much over 100 degrees, but since i have been using mobil 1 it seems to be high all the time, when i say i high i mean with semi fast driving it creeps up to 110, my car never used to do this, im slightly worried, can any one help? i changed the oil about 3k ago and i use the mobile 1 stuff 5-50w! i can appreciate that the weather is that much hotter at the mo, but has anyone else had any problems?