Engine oil LIQUI MOLY or Castrol

I have always liked and used Redline in my non-German cars. In my German cars, I have used either Lubro Moly (also known as Liqui Moly) or Pentosin, both in 5w40. Great synthetic oils, imo. I would not run Mobil or Castrol products if you gave them to me for free.

I use 5w-40 Castrol Syntech oil in my 2010 3.6 CC. I believe that if you are going to keep the car for a long time( over 100k miles) then I would use the thicker oil for better lubrication and wear protection. Owners in warmer areas like myself should use the 5w-40 due to the higher summer temperatures which will break-down the 5w-30 oil faster than the 5w-40 oil especially after a 10k oil change period.

I've been running Castrol 5w40 in my car and have had no problems.

Castrol GTX 5W-30 with an STP filter. NY area. 178k miles with no HLA tick so far. Had some 10W-30 in it before during the winter and the car didn't like it too much, took over 3-5 tries cranking to get it started.

I use Liqui-Moly 5w40 and have with several VWs. Great oil, imo.

In my gen 3, I've used Castrol OE Professional 5w40 (the Castrol in the gold bottle that the dealer sells - oil has a green tint to it), both when I did the 5k mile change and when the dealer did the 10k change.

Used Castrol 0W-30 in the past with the GTI and GLI. Pretty decent oil analysis numbers when tested.

LiquiMoly 5w40 full syn...........its some good shizzzz and at a fare price

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.