2009 Jeep Patriot 2wd 2.4ltr 102k miles Changed my oil 6200 miles ago on January 1st, 2019 and used Pennzoil Platinum Full Synthetic and a Mobil 1 EP filter, I ran 5w-30 because I live in Texas and am a real estate photographer and drive all day every day with a lot of stops and go. I have no idea what was in this vehicle before as this was my first time doing an oil change because I had just purchased this vehicle "Used" in Nov of 2018 from Autonation. At the time of purchase there were no oil leaks, and neither when I changed the oil. I got around to checking the oil today and it was about an inch below the min line of the safe zone. I have no idea where the oil went. I thought since I was roughly still close to my factory oil change interval I would be ok especially since I used synthetic oil, but then I did some digging and read a review on the Pennzoil website and another person mentioned experiencing this same issue where he assumed it had evaporated and needed to add more oil before his scheduled oil change. My question is, does anybody know if there is any truth to this theory or if this is an ongoing issue with this particular oil? I'll admit I don't know much about oil other than everything that I have learned from this website and youtube videos. I understand that the detergents will dissipate, but will it also cause that much oil loss or could it have just been due to 10 months of driving? (this was a slow year for me). If that's the case it seems like I should switch to an oil that won't have this much loss and require adding oil between changes which equal money wasted. I wanted to try the PP HiMi ($37.88 with M1 filter) this time around but now I'm not so sure. Even the PUP 5qt and M1 filter at Walmart is $39 but not worth it if I'm going to have the same issue. Thanks in advance.
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