I live on the west coast and use 5w40 LiquiMoly from NAPA @ $36/5 Lt. It made my CF life go from replacing every 10k miles to getting nearly 20k miles/CF.
I've run somewhere between half a dozen and a dozen oils over the last few years with oil analyses for all of them and both the analyses as well as my own personal observations favor the LM by a bit over other high quality full synthetics offered by Motul, Redline, etc. Specifically you want this one: https://www.amazon.com/Liqui-Moly-2332-Leichtlauf-Engine/dp/B00LIC29H6
I've doubled my cam follower life, from 10k to 20k miles, by switching to LiquiMoly 5w40...and it costs less than Castrol full syn recommended by VW.
I ran the dealers Castrol for 20-30k miles. Switch to Motul and my temps went up easily 10°F, it would settle down at around 230°F. Catrol never went above 220 unless I was stuck in traffic. So Motul would creep up over 230 at times.
Then I switched to LiquiMoly Leuchteifeifafehffhefh. The oil temps better match Castrol and sit around 220F unless stuck in traffic. BUT the LiquiMoly gets up to temp much quicker than the Castrol ever did.
It is the same with both Redline 5W-40 and Liqui-Moly 5W-40. I usually run between 190 and 202 degrees for oil temperature.
Everyone pushes whatever brand they use but when you're talking group 4 oils you're splitting hairs to some extent because they are premo quality. I've run them all and if I had to pick I'd probably throw my hat in for Liquimoly Leichtlauf High-Tech 5W40. That's the full synthetic version. Watch out there is a synthetic blend version they sell now, not as good.
Decided to go back to (and probably stay with) Liquimoly Leichtlauf 5W-40 (the blue bottle that says fully synthetic).
Liquimoly in all my VW's. 5w40. Liquimoly in all my friends VW's as well. Everything from a Mk4 2.0, to a MK7 R, to turbo R32s. ****s the best.
I run LiquiMoly, zero issues.
I've used Shell Helix Ultra 5w-40 and 0w-40 in my AQY. (we have cold winters here) Both seem to work well, no additional lifter noises, normal mileage. Engine sounded good even just before this years oil change.
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