Engine oil Castrol or RED LINE

I prefer to use castrol gtx 20w-50 year round, but I'm being cheap lately. I've put over 120k on my 16v with this stuff so far

Dealer put Castrol SLX Professional LL03 5W30 in it.

Redline appears to be more interested in using the best additive package to make the best oil, not having to use pre-tested additive packages that may be geared more toward fuel economy.

I'm using Edge 5w-30 too. Seems to do well in 1.8t... This is the dealer OE oil, if it's VW 504 it could be a problem with lowered additive levels for emissions protection, which does not work well with our fuel and engine tune in North America, although it is necessary to use in TDIs (VW 507). imo, Edge is the best of all words, a premium base oil, but with more additives than VW 504 or other low saps oil.

I use Castrol 10w-40 and it works great. I have no issues with the cam follower and also never have to add oil in between oil changes.

my 2.0 has 280,000km and no leaks or burning at all. i never have to top up. i use 10w40 castrol even in the winter. i used 5w40 mobil 1 in my other golf last oil change and it works great too.

5w40 + Canadian winter = NASTY valve tick upon start up. 5w30 cured this. I run 5w30 through the summer and its fine, even on the 30+ degree days. Now if I was in Mexico or southern Texas in the summer, maybe a 40 weight is a good choice.

Doing awesome in single digit F weather.

I put Edge 5w-30 in my 2.0 TSI a few days ago. Drained fresh dealer Syntec 5w-40 to do so. 5w-40 is very thick in cold, which is bad for turbo apps. This is the reason for the evolution of 0w-30 and 0w-40 oils, however 5w-30 synth is thinner than all in the cold, near zero F, about 1/2 as thick as 5w-40. Edge is likely the same formula as the VW spec SLX Pro OE anyway. All the new VW 504 oils ARE 5w-30s, ftr. A consensus is forming around Edge being the best of the thin 30 weight synthetics. It worked great in my friend's 1.8t, at a decent interval. 5w-30 synth is a great choice for winter, and seems fine in hot weather too. Thinner oils simply protect better now because of their improved additives. my engine is running great now

I could not get anywhere 5w-40 Castrol, so I got 5w-30 Castrol Edge, the car seems to perform better than it did before, after changing to this oil.