Hi 2 u all when i first start my saff cossie 4x4 up on a morning first thing the tappets r quiet n then after about 2 to 3 mins they start 2 become noisey for about 5 mins then go off.Im using castrol rs 10w 60.Im gonna change the timing belt n tappets 2 c if this cures it.I hope its not an oil pressure fault.