thanks all for the input, i too had thought this at first, but this is what i have actually found using this oil 1,no smoke what so ever on start up or running 2, no signs of any weeping around the seals 3, oil pressure is the same as it was before and i was expecting a bit of a drop especially when hot 4,the oilman here also gave this the thumbs up for my spec 5,it is now quieter on first start up .
So all things considered it was a good move more me, what i can tell you that it took me about a year to source a genuine low mileage imported TT and with all the service history and the proof is in the pudding when it comes to things like this..oh iam the first owner since import and saw the car pretty much off the boat ;-)
Look here as the castrol web recommends 0-30, I've gone 0-40 as i have a few mods:sly:
http://www.castrol.com/castrol/iframe.do?categoryId=9024084&contentId=7044829
You all have to remember that we all are probably using different viscosity oils as we are all at different stages of tuning, so what good for one may not be good for another and don't believe everything you read on here as its only a guide line...and some take what other people say as Gospel, personally i prefer my own judgement as i have been in the motor trade now for 23 years+ and at different levels from prototype building for manufacturers to regular stuff, not that i don't listen to what people have to say;)
Iam going on a bit now:rolleyes:happy Easter every one:)