ok didnt get time to update the thread so please read.
First Fault.
I bought the Guard oil filter from metro cash and carry. thought it would be genuine and in good quality.. i changed it with the new oil i put in only 2 weeks back..
it was not working and was not pumping the oil to the head cover/tappet assembly.
( Remeber Guard is not a good one anymore.. lots and lots of complaints.)
First i got the oil filter changed and put the other one and it started working and oil was coming through.. but again the rockers were totally jammed since no oil was running through them so took out the rocker assembly cleaned it all up and when the mechanic fixed it again alas 2 tappets had gotten loose on their grooves which were beyond repair so had no choice but to replace the whole rocker assembly.
got the almost new ( kabli ) rocker assembly for 5500 and now car is smooth as silk. I would have never thought of a faulty Oil filter could happen and this is how it ended..
thanks for all the valuable hints and tips from fellow members.