the tapping noise is probably the timing chain rattling, very common on the suzuki v6 engines. i'd look at running an engine flush through it when doing the next oil change & go back to the 5w-30 & pick up a genuine oil filter. the timing chain is hydraulically tensioned & the oil galleries can clag up not giving the chain enough tension, the other one & i'd hope suzuki had sorted it out after 10years is the timing chain guides tended to break up on the earlier version of the h series motor.
this is bleed procedure for bleeding the lifters on a h series V6... a good solid thrashing usually does the trick. eg getting the boot into it going up a decently long hill.

maybe if you can post a vid of the noise it might make it easier for us to diagnose... the timing chain rattle can clearly be heard coming from the front part of the motor.