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I continue to use full synthetic oil out of habit from when I used it in my previous car, a Ford Crown Vic V8, in which I ran full synthetic 5W50 with slightly hotter burning plugs while living in the hotter southwest. That car lasted 20 years and 200,000 miles. The engine was still going strong; but, the frame rusted out.
There are indeed two O-rings that have to be changed when I change the oil filter on the Sonata V6. There's one on the filter hanger and one on the cap. The equivalent of a filter canister is built onto the engine. Another reason I like to change the oil and filter myself is that I can ensure the filter hanger and canister are cleaned out. I change the oil & filter about every 3500 miles.
While I don't change oil weights with the seasons anymore, I do use an oil additive in the winter. Z Max is a micro-lubricant that I add at this time each year to facilitate cold starts. I've been using it for years since I've been in a colder climate, in both my current Sonata and previous Crown Vic, and it makes a noticeable difference in ease of turning the engine over before the oil starts circulating and warming up. It also reduces friction perceptibly when engine braking.
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