I'm sure this question is as old as time itself. But I want some quick recommendations based on Irish prices
127k miles, stage 1. Track day coming up on Easter Monday. Halfords won't have my usual Millers NT+ for €75 in stock on time, nor any non-NT+, so I have to consider other options. I change my oil every 5000km, 3.1k miles.
(All are 5L, available to buy locally):
€91 Miller's 5W40 CFS NT+
€59 Shell Helix Ultra 5W40
€67 Castrol Edge Titanium 5W40
Called the local VW dealer here and they don't do anything besides 0W30/5W30.
Millers NT+ did reduce my oil consumption by nearly half compared to the Shell Helix Ultra I used before, which makes me slightly biased towards it. But buying it meant I didn't have to spend and extra 20-25 quid on an additional 1 litre bottle to top up since it burnt so much less oil.
Cheers!