I have have had very good experience over the decades with Liqui Moly 5-40 and Total Quartz 9000 5-40 Both are excellent motor oils
I use 10W/60 Liqui-Moly with all my engines. I am old school and to a point, thicker is better.
Only vw507 that I can get in my area is motul or liquimoly. I get whichever is on sale.
I’ve been using top tech 4200 for years in my CKRA passat and swear by it. No issues at all currently at 175k miles
Used to go with Mobil 1 ESP for my Passat, but after discovering idParts.com, I now only run Liqui Moly as it was cheaper for me to buy an oil change kit on their website than it was to run to my auto parts store
Liqui Moly is good.
I only use liqui moly toptec 4200 in my 12 Jetta tdi
The 5w30 or 0w30 is perfectly fine. Since I live in the US Midwest I’m going to start just running 0w30 liqui moly year round
I use liqui moly Toptec 4100 because in India, spec for 2.0 TDI is 5W40 and we do not have DPF so VW505 oil is recommended which Toptec 4100 conforms to .
The most notable change between the Gen1 and Gen 2 is viscosity. It is much thinner than old oil. few of my customers have already noticed higher oil consumption compared to old formulation. Liqui Moly has done the same. They have reformulated their popular Leichtlauf 5W40 to much lower viscosity. @ 100C it is almost as thin as 5W30.
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