So I bought my DD brand new and did my first oil change at 3500 miles to get the break in crap out and switch to full synthetic. My Nephew-in-law works at a fast lube express place for a dealership and has been giving me some info but he advised me to ask you DD experts in here what you think. My engine oil cap says to use 0w-30. However I live in Palm Springs CA where its very hot in summer and very cool in Winter where its rarely gets below freezing out here, NO SNOW. So for my first oil change we decided to use Castrol Edge full synthetic 5w-30 in the DD. Ive put now about 6000 miles now on the car and my gauge is showing 30% oil life left so Im about ready to change it out. my question is what oil weight should I really be using for this engine? the engine cap says 0w-30, i see a lot of you guys talking about using 5w-20 or even 0w-20 but since i don't live in a freezing climate I figured the winter weight doesnt need to be 0 so figured 5 would be ok. However that aside, should i use the 30 or 20. My nephew says these motors have very little tolerances so maybe i should stick with what the engine cap says at 0w-30 or maybe stay with 5w-30 or do you think I should go to 5w-20? I've even thought about 10w-30 since Im in a warm climate and summer is coming quick! Please any info you guys may have for me would be great. I just want to use the best weight for my engine and not use the incorrect one. Also I have heard some very slight tings here and there when my window is down and not sure its my engine or something else. I usually get regular gas from Same Club and sometimes costco and Flying J so not sure if thats gas related or what!