Engine oil MOTUL or OEM Volkswagen
Motul 7100 10 w50 good after using 4000 km
Motul 7100 4T 10W-50 i use this and it's pretty good
Same motor (same car) and I use 5w30 Motul 8100 X-Clean EFE
Motul 8100 Power 5w40 oil. My shop recommends it, I'm based in NC, Autocross in the summer sucks, but my oil temps drop back around 214 degrees F when I come off the track.
Motul full syntetic 10w40, oem oil filter.
I use Motul in my built engine (not IAG) per the recommendation of the shop that built it.
If it’s actually an IAG long block, they spec Motul 8100 X-CESS 5W-40 (or an equivalent high quality 5W-40 full synthetic) because their bearing clearances are set up for that weight, not the thinner OEM oil.
If you are using VW original oil then stick to it and the service interval. 15 years 229,000km later mine is going strong. I did mess up by doing service at 15k km all these years. Sticking to 12k is best. Instead try iftex system D. Makes a very noticeable difference. More important I feel is changing the air filter more often. And compulsorily changing diesel filter every year.
Vaguely remember having the oil and brake fluids changed for my 40k, and maybe a tire rotation.
motul 8100 is defenetelly worst oil you can use.
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