Engine oil LIQUI MOLY or RAVENOL
I just do the liqui moly. Also I change my oil well before the BMW recommended 10k.
I often go for liquymoly or Motul 4t 10-w40 fully synthetic oil for my big machine.
LiquiMoly oil is the best. Top tec 6310 0w30 is what I use for the THP.
I used to have a B8 and kept my oil level OK as per the MMI and only used Liqui Moly oil.
Liqui moly 4210 pricy but dropped my temps 10 degrees 0w30 vw 504 rated..
I always run liqui moly 5w40. It's just thin. Change it every 5k miles.
I had been using Penzoil Euro L as well and have switched to Liqui Moly. I don't get my oil from FCP but will say Liqui Moly seems to be a very good oil.
I have an Octavia 2.5 vRS TDI and it has 450k km now, it only drank 5w30 and never an issue, not even in cold winters and I had a few -25 starts and it started right away, at the first key turn.
After NGP Racing rebuilt my engine in 2015, I found out about LiquiMoly. Read up on it and sticking with L.M.
US manual states 507 can be used, but you might get worse fuel economy... Mine is about 0.3 mpg lower on liquimoly toptec 4200 5w-3p
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