I've used only 5w30 full synthetic (usually Mobil 1, sometimes others) since I bought mine 15 years ago (D15B7). Using the high-mileage variety nowadays, supposed to help out the old seals etc. Just over 150k miles but engine runs very smooth so seems to be doing the trick.
Castrol Edge European formula 5W-30. Closest thing to group IV you can easily find in the states.
I use Mobil 1 synthetic blend HIGH MILAGE 5w-30. I think the high milage formula is the best for these old engines.
I switched from the lm to Castrol and it works as intended at a much more affordable cost.
I use 5w40 Castro’s European blend in my 06 e60 530xi and it seems like it does the job.
I used Castrol Edge 5w40 last oil change and the engine feels smooth and burns little to no oil.
I used Castrol GTX 10W-40 High mileage and never had issues.
Pennzoil Ultra Platinum or Castrol Edge are probably the best all round oils.
I put 5w40 in mine, that's what is recommended for mk6 at all temps. Summer or winter months. I use Castrol Edge Full Synthetic high mileage, works a charm.
Mobil 1 - thins out a bit and there was quite a bit of consumption when I used this oil for my first change
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