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What ever oil you get make sure it's good brand name stuff, if you go synth remember there is no turning back. Also synth oil is more slippery, so yeah it coats better but leaks easier. I think the hyundai oil is castrol natural synth blend and if the dealer uses the real hyundai oil thats actually good stuff. DO NOT USE CHEAP UKNOWN CRAP!!!!!!! also synth is not so good when you consider you do have to change the oil every 3,000 miles/5,000km it's not worth the price. As I also said one you do go synth it's not a good idea to go back, if your car has had synth for 3-5 changes already it readjusts to it, going back is bad.
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