HEY GUYS IM A TECHNICIAN BUT HAD A QUESTION. I HAVE A 2011 IMPREZA OUTBACK SPORT.WHEN THE CAR IS COLD ITS FINE WHEN THE ENGINE WARMS UP TO NORMAL TEMP I GET A SLAPPING NOISE. I HAVE HAD THE LIFTERS SHIMMED AND BEEN IN THE SHOP FOUR TIMES FOR THE SAME ISSUE THEY KEEP SAYING ITS NORMAL.ME BEING A TECH I HAVE ARGURD AND ARGUED TO NO END ANY HELP WOULD BE GRATEFUL BEFORE I DRIVE IT THRU THE DEALER SHIP SHOW ROOM.

 

got the right oil in it ? silly question i know but you never know

 

5W 30 FULL SYNTHETIC EVEN TRIED BUMPING UP A WEIGHT TO SEE IF IT WAS GETTING HOT AND THINNING OUT AND CAUSING THE PROBLEM.