I am due for an oil change for both my '10 Elantra Touring as well as '06 Chevy TrailBlazer. I am torn between going conventional or go to a full synthetic (Royal Purple/Mobil 1). Would spending extra money on synthetic for both vehicles worth it? I am also debating going aftermarket vs dealer oil filters. I have read all the posts regarding the filters and TSBs, so I'm a little hesistant in that regard. Can someone please shine some light into the matter?? Thank you all!!!!
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