after I use lift a couple times I hear a "tap tap tap tap tap" sound from the engine, the higher I rev and the longer I run at high rpms the loud/more frequent the tapping gets.
I run mobil 1 (for a long time now) and changed every 5K
I agree...I only have VVT-i but this still happens to me clicking/tapping sound from the valves, I switched to Mobil 1 synthetic and it help a lot but still happens when I drive hard. Typically if I drive "normal" for a day it goes away completely till i decide to drive hard again.
they say the valve chatter is common among vvt-is...i hear corolla and matrix owners complain of the same thing. i have it in my car and any synthetic i use whether it is mobil, castrol, or royal purple...it ticks...
I also heard that our valves are self adjusting, and dont need to be serviced for clearances, is this true and could it be the reason for the excessive clicking/tapping after hard runs? Seems logical.