Quote:
Originally Posted by Oli18
...which is also made by Castrol! 
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Dead right!

Only use the best and original oil in my opinion. I have built many engines and found that the original oil has always performaed best. Many other brand's oils tend to tea-leaf as they react with the fuel that gets past the rings during normal operation. This tea-leaf effect causes blockeages in oil ways and even the oil pick up strainers. MASSIVE problem on 1.8T's, RS4's and on RS6's (V8) can cause major turbo failures.
Even Castrol get it wrong though..... the old Long Life 2 SLX (0w 30) wasn't good! But newer Long Life 3 5w 30 is great and I've had NO issues at all. Same can be said of the QUantum (Castrol) SYnta 10w 40 Semi synthetic. I use this in all the older cars and many of the track engines I have built.
Saving a few quid on cheap oil WILL cost you in the long run, just the same with petrol or Diesel! YOu get what you pay for! A few more pounds on oil is worth it to avoid an engine rebuild when your oil pump clocks, wrecking the line bored cam shaft bearings and therefore scrapping the heads!