Engine oil Castrol or Motorex

A few years back I picked up an S65 engined M3 (E90) after work on a Friday. I hit the 155mph limiter that night, Sunday morning it was doing track duty. In 3 years and 50,000 miles it had 3 oil changes and the 1qt of Castrol Edge TWS I kept in the trunk for top-ups still had some oil in it!

My car uses about 0.5 qts of oil every 5000 miles. I think castrol 5W 40 is the best oil for this car.

I did notice the German Castrol had a smoothing effect on the big 5-cyl.

For my 24v I use: Castrol Edge Professional OE 5w40

Best oil IMO is Castrol 10w40 high mileage part synthetic, usually good specials at local auto parts stores and Walmart.

I'm in LA and I use castrol oe professional 5w-40 on my rebuilt 16v. The best oil I've used so far in my mk2 and I've tried a lot (Rotella t6 5w-40 Mobil 1 15w-50 and Total Elf 5w-40) all synthetics. Try it out. You won't be disappointed.

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 spent ages today on the phone to numerous SEAT dealers, VW dealers, SEAT HQ, VW HQ, Castrol and Millers. The bottom line is total confusion everywhere. I rang 12 SEAT dealers - all but one (I'll come back to which one)said that VW 505.01 must be (and is)used.