Hi all, I've got a 2009 Ford Mustang, it is the GT with the 4.6L 3-valve V8 motor. For the sake of keeping the post short, I will just list my info for you guys: -2009 Mustang, 4.6L 3-valve V8 motor -Purchased the car used with 10,000 miles on it in a moderate weather state (50F - 90F all year around). -Do not drive car much at all, maybe 50 miles a week at most--it is a weekend car mostly. Usually change the oil up every 6 months rather than hitting the OCI mileage. -99% city driving (lots of stop and go, lots of idling), rarely sees freeway action. Short trips are typical, 5-6 miles at a time. Frequent cold starts. Driven moderately to aggressively. Typically shift at 4000RPM or above but usually gentle part-throttle acceleration (6500RPM redline). -Original owner used Ford Motorcraft 5w20 semi-synth stuff with Motorcraft filter. I have changed the oil/filter 3 times since with Pennzoil Platinum 5w20 and the same FL820S Motorcraft filter. -I have now moved to a state where it snows 3-4 months out of the year and the car will be driven in freezing temperatures. Ford Recommended: -7500 mile OCI or 6 months. -5w20, ford spec: WSS-M2C930-A One and only UOA I got: 50/50 city/highway driving (I have since put another 5000 or so miles on it, also using PP): So basically, I came across some Pennzoil Ultra on the shelf the other day which got my curious. I figured that at this point, I change the oil maybe 2 times a year at most so the cost of the oil change is not a huge factor. I also do short trips and my habits are far from babying the car around (leadfoot), I frequently rev close to redline more than I drive "normally" in this car. The car has an aftermarket intake and camshafts but nothing major to really affect the oil. What do you guys think I should change up? I got some PureOne filters on sale a while back so I will probably use those up. In the meantime, I've depleted my stock of Pennzoil Platinum so I'm looking to see if there's anything better out there. I doubt I will ever get this car driven enough to establish a strong history of UOAs--on the last one, Blackstone commented that my motor was probably still breaking in. And again, price is not a big factor but there's no way I'm going to pay the $30/quart for that Motul stuff like I did that one time...we don't talk about it. I have no problem shelling out the cash for synthetic. I have a completely illogical obsession for running "the best" oil--especially if you tell me about the oil groups and how esthers are awesome or whatever (I don't understand it really but one time, i was told Motul was Group V and $130 later, I tried it). So with that, I have no problem ordering something online if that means I'll get a better product for my motor. Store bought it totally fine too. I ran German Castrol on my previous vehicle with no issues but I never did any UOA's to prove anything. With that said, I am not really partial to any brands but I don't really like Royal Purple for no good reason (probably because I feel like their advertisement is so exaggerated). On that note, I am also not a huge fan of Amsoil because they have a strange business model / marketing strategy. Either way, I'd consider anything and everything so long as I'm convinced it's a good buy! Thanks guys!