Quote:
Originally Posted by xoxoxoBruce
... You might use a little heavier oil, ...
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I have an '07 Sonata, 3.2L V6, in which I've changed the oil myself (I use Castrol full synthetic oil) since I bought the car new. When I've bought Hyundai oil filters from the dealership (to maintain warranties), the mechanics cautioned me to use
only 5W20 weight oil even though the owner's manual says that 5W20 or 5W30 can be used. They said that the engine oil system was designed expressly for use with 5W20 and that heavier oils could cut down oil flow. They had no reason to make this up as I wasn't buying either the oil or the oil change service from them. I don't know if this applies to earlier models of the Sonata and engine variations like the V4; but, I thought I'd mention it.