I prefer Castrol 20w50 in my 1976 CB550, at least in the summer. Non-Synthetic
I'm using Castrol Syntec Euro formula which is a 0-30 oil. I've been doing oil analysis with every oil change since I got the car. This change was a short interval with just 1400 miles on the oil between changes. Right in the middle was a track day where I did about 130 miles on track, six 20 minute sessions. I think I was seeing peak oil temps in the 240s with very quick recovery back down below 220 during cooldown.
Castrol A747. The only failure I've ever had was down to incorrect assemble. Smells lovely too!
I always ran the Motul Grand Prix in my shifter, I never had any engine problems. Still run it in my dirt bike, I love the smell of it, too.
I use Castrol Syntec 10w-40 in all of my VR6's and change it around 3000-4000 miles with oil filter (Meyle, Hengst or Topran) I use it in my MK4 and even in my old ass MK3 and never had any problems whatsoever. My MK3 VR6 that a sold a few months back, a.k.a. The Silver Bullet, has over 150K miles on the odometer and still counting and she runs like a beast. The lifters are ticking a bit loud but that's common for any high mileage VR6 engine.
I use MOTUL for my oil.
Vw recommends Castrol I wouldn't use anything else
When I changed to full ester Motul in my motorbike, there was a noticeable reduction in the time it took for the startup rattles to quieten down.
Castrol Syntec 5w40 is stout enough for the 10,000 mile oil change.
I've used the OE spec Castrol syntec 5w40 since I bought the car brand new. Do my own oil changes every 5k with the stuff and no issues.
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