Liqui Moly Molygen 5w40. Not cheap but I swear by it, made the engine quieter too
I use Liquimoly Molygen (5W-40) and I’m very content.
I had oil burning issues even with 10W-40 in my high mileage 325.\nMy mechanic put in LiquiMoly 10W-60, which seems to be much better.
5w-30. I use LiquiMoly Molygen and my experience is good.
I personally am changing my own oil with full synthetic on my 23 2.5T every 6000 km or so. No need other than peace of mind for me. Doing it myself only takes 30 minutes and $35 in oil, filter and crush washer.
For [Naturally-Aspirated Skyactiv engines](https://en.wikipedia.org/wiki/SkyActiv), it is highly recommended that you use Mazda's own(Idemitsu) high molly GF-5 0w-20. [Arguably it is one of the best oil for skyactiv engines](http://www.cleanmpg.com/community/index.php?threads/45295/#post-357910).
I use it on my 2016 S5 and it’s wonderful. It’s basically the same as Leichtlauf just with the friction modifier and UV capabilities if you need to spot an oil leak (only in the first 300 or so miles because then the oil gets too dirty to work with the UV). I’ve heard the friction modifier works well in older performance cars due to the increased wear of their engines. Yes it’s technically not approved but you won’t go wrong with it.
I use the Leichtlauf High Tech. Really helped my higher mileage SQ5 with chain rattle.
Got an oil change @ 94.1k using liqui moly 5w40. Low oil Light popped up at 96.4k. (Added 1 quart). Now I’m at 96.6k. Checked again and the bar is just one level under the “max” Why am I burning oil so quick?
It’s not any better than Walmart Castrol, just double if not triple the price. I’m 160k tuned!!!
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