i wont be taking it on the track. I will give it the occasional stick out and about but nothing extensive to make me think i need the 10w60 oil. I just dont think what i use it for it would ever get hot enough to see its full benefits.
The 5w50 sounds a good compromise. Bearing in mind what the last chap said, does the valvoline oil meet all the required oil specs as required by the v6, and where is the best place to buy it from. Dont think i have ever seen it on sale tbh
5w-50 would be a good compromise as is a 10w-50 like Silkolene Pro S, which is a true Ester based synthetic. Valvoline is also a good brand and will comply with the correct specs.
I had the 10w/40 semi synthetic shell ultra in mine when i bought it, when the engine got hot after driving it slightly hard and stuck in traffic etc the performance suffered and the engine note would change a touch. Switch to 10w/60 fully synthetic, and the engine note stays constant and still copes well when hot.
I know its slightly thicker but seriously if u warm your car up before u drive its no problem. Its not that thick that it would damage the engine, experiment urselves pour some 5/40 10/40 and 10/60 into the oil filler cap and have the sump plug open and time how fast each grade of oil starts draining out of the sump plug hole, u'l realise its not that thick, if it did damage engines like that when cold it wouldn't be on the market.
I think selenia is a synthetic based oil not fully synthetic? I remeber reading that on the back of the can.
Selenia is fully synthetic, however it is the cheaper "Hydrocracked" version as opposed to the POA or synthetic Ester which are more expensive.
Selenia racing also doesn't meet the requirements of API and ACEA specs so I would avoid it.
If you did the experiment with the oil filler as you suggest, you would find the 5w-40 flowed faster than the 10w-40 and 10w-60
The 5w-40 is thinner at lower temperatures, where as the other 2 have the 10w grade
The 10w-60 oil just wouldn't thin as much as it warms up in the engine, hence the higher "60" rating.
My oil recommendation for a slightly oil thirsty TS would be Silkolene Pro S 10w-50 although out of the 7 TS cars I have owned I have never had a really thirsty one. I normally used 5w-40 fully synthetic such as Texaco Havoline, Gulf formula G, Motul 8100, or Shell Helix Ultra and had no issues.
Oilmam on here has some good threads about oil, do a search.