Hey there,
I have a GV, so similar motor. I had the problem easry on ( was running 10w30 and the Pennzoil filter the Quick Lube used. My ASMC Distric Service Manager told me how to correct it. Once I follwed his directions the noise is gone, and I'm at over 80K.
This coms right from my DSM,
1) Use nothing but high quality 5W30, and preferrably dino oil.
2) Make sure that you use a filter that meets or exceeds factory spec. Most don't, especially Fram and similar cheapos. So far, I only know of Susuki Genuine Parts (SGP) and Wxi/Napa Gold (not Napa Silver)
Thin oil is needed to make it's way up to the top of the timining chain quickly.
The factory filter has two important features. One, a pressure relief valve. This is if you are dumb enuff to never change your filter and it gets clogged, it will bypass before it blows.
Two, and most important, an anti-drainback valve. This keeps the system primed. Only the Wix and SGP filter have it in my searches.
I use SGP, as they are only $5 for the filter and drainplug gasket (it's copper and a one-time use thingy). I also use Sunoco oil as it's virtually clear.
HTH,