To the OP:
How clean is it keeping the engine?
API SH does not have the advanced detergents we have today.
I bought this 08' Elantra in August 2012 with 28K on the clock.
Apparently it had been used mostly as a station car (short tripped to and from the train station). It had some varnish on the baffle (it's hard to see anything beyond that) so I added a bottle of AutoRX (because I had it). I ran a few short OCI's of Pennzoil dino and then started running synthetic with this 7700 mile OCI being the longest. The varnish on the baffle is nearly completely gone. I would guess the syn. oil combined with several 5+ hour drives have helped.
My feeling is that this Hyundai Beta engine was designed when these oils (SH, SJ etc...) were prevalent and that many of them have gone 200K+ on such oils so I'm not too worried. This particular engine uses virtually no oil in 6 to 7K which makes it ideal for these older (higher cat killing phosphorus) oils. It seems to like them.