What oil weight is best for the 2.5l?

[1stBlkBoxster]

So a few weeks ago I got the first oil change since I've owned the Boxster. I used Mobil 1 full synthetic and am now wondering if I used the right weight. I used 10W-30 and ever since I got it changed there's a slight ticking coming from the engine. It's more noticeable when I start it up in the garage. It still runs extremely smooth and there's no issue with performance. So I'm wondering if I should've used a heavier weighted oil? I live in FL so the climate is a little warmer. Thanks for any input.