Most 10W-60 oils are crap. Don't get the hype about it.
The additive package is bad (the oil ages fast) and after some miles of hard drive it is like a 10W-35 dishwater. Maybe castrol has some good xxW-40-oils but the 10W-60 isn't up2date.
Prefer a good 5W-50 which is after 6000 miles like a 5W-48 instead of a 10W-60 which is after 3000 miles like a 10W-35 cause of the bad additives in it. The grade says nothing about the quality of an oil.
Even the manual of the cosworth recommend a 5W-50. Most I do not agree with the manual but some recommends aren't so bad. Mobil 1 is a great oil for example and has some of the best additive packages.
And ester oils are treaten with caution. To much shear stability (HTHS) do harm to the engine (to much drag for the bearings etc.). Ester oils are for motorcycles or high revving engines. Most cars do not revving higher than 9000 therefore it is needles or even bad for the engine....... a good 5W-50 has enough shear stability.