Well I used some engine/lifter cleaner you pour into the oil to clean out... And changed oilfilter, valvecover gasket, checked sparkplug for being loose and filled it with ///M Racing oil - a Castrol 10W60. That dident help... But luckily the shop who are gonna change all the lifters would also do oil change and they just re-use my oil change here so you can´t say the money is wasted, it will only get cheaper at the shop.