HI all! I've been lurking around here for a while now looking for some answers. I have a 2013 Hyundai Santa fe limited with the DI Lambda 3.3L V6 bought brand new in 2013. The first 100k kms on the car the oil was changed by the dealer with conventional oil at 6000km/6 month intervals as they required under the "Severe operation" maintenance schedule. It now has 123,000 kms on it and sees very short (10kms x 2) daily drives. I have extended warranty on the vehicle to 160k so I still have to maintain the 6k/6month OCI. The biggest [censored] off is that even though I'm a licensed car and truck mechanic, the [censored] aftermarket warranty contract specifically states no DIY maintenance. I've fought with them to no end about this but they're not budging. Consequently I find my self wondering how well this warranty is going to go... But that's another story. The more I've been reading, the more I've discovered what I believe is the timing chain tensioner rattle for 2-3 seconds on start up that has plagued the Hyundai v6 for years. I've been using OEM filters with Motul xclean 5W-30 since I took over the oil changes. Mainly because I'm running the 5W-40 Variant it in my Subaru STI and get it for $45 CAD/5L jug taxes in. So my question is this. I have an impending oil change on the Santa fe and am contemplating my next move. Should I consider switching back to conventional Quaker State 5w-30 that the manual suggests? Maybe the synthetic oil is allowing the tensioner to bleed down? Too thin? The manual also states I can go to a 5w-40 under my climate. Should I try that Motul oil? Go to conventional 5w-40? My biggest concern is with winter coming I'm not sure weather the 5W-40 will be too heavy or not. I know the 5W is the winter viscosity but 40 is a thicker oil regardless of how you spin it. You guys are the pros here. Give me some input!