I use the Liqui Moly 10W-40 you mentioned in your OP.
It's reasonably priced and goes really well. I use it in my Corolla Sportivo though.
I do my changes every 5000km though since I rev out my car every now and then.

Not sure how much weight this claim carries but the guy at autobarn stated that LiquiMoly is one of the few companies that carry fully synthetic oil, as in, 100% synthetic. Other brands which claim they are fully synthetic only need a rating of 50% synthetic oil to be able to slap the 'fully synthetic' label on. Whether this is true or not, I've already bought another bottle of it for my next oil change (Y)