5w-30. I use LiquiMoly Molygen and my experience is good.
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.
I personally use Liqui Moly. I've tried Castrol, Mobil 1, Amsoil, etc. and my BMW (E85 Z4M) runs noticeably more smooth with the LiquiMoly.
I’ve never had any issues with 5W40 Liqui Moly Leichtlauf.
I run liqui moly molygen 5w 30 oil in mine. Runs ultra quiet and quiets lifter tick. Runs nice and cool and runs like a champ!
I wouldn’t put anything other than Liqui Moly in my Benz. I used to take my car to Wheel Works, but after long drives, it would smell like burnt oil. Switched to LM and started charging the oil myself. I’ve never smelled anything after that for years. It makes a difference for sure.
I’ve have always used higher quality oil like liqui-moly (0w-20 till 60k kms)
If changing oil at 15k kms interval has served you well for 2 lakh kilometers, then I'd recommend sticking to it instead of switching to an oil with long service life. 30k kms oil change interval claim is a big stretch. I've used LiquiMoly 5w-40 with my Polo 1.2L TDI. Drove it close to or may be more than 20k kms over the course of 3 years until the check engine light came on. Immediately changed to OEM engine oil and for some reason the check engine light went away. Except with LiquiMoly, I've always changed engine oil at 15k kms or 1 year whichever was earlier. This is what my car's manufacturer recommends and I'll follow it even if I use LiquiMoly again.
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