Well - she's all installed and car's a hoot. Stuck with the 300LS 75W90 and will change it to 80W140 in 6months time and see what difference there is.
Took it for a run this afternoon around some of my local side strips and let er rip.

I must say some launch advice (I think it was 32Krazy..thanks) has been a treat,
...but this time it seemed so much more stable and very little chirp.....brilliant!