Ja tsw je bil narejen ravno zato, ker je castrol spremenil izdelavo olj in edge sport ni bil več dovolj dober (maš polno o tem napisanega na netu, še bmw tovarna je mela ene konflikte s castrolom)
TSW naj bi bil mnogo boljši.
Vseeno pa je 10w 60 zelo velik razpon, kar je slabše za dobro HTHS cifro (
http://wiki.seloc.org/a/Oil_Labelling_Explained )
Pa še tole iz tega linka:
HTHS - High temperature High shear A relatively new oil test/specification, the oil is subjected to high temperature 150C and is mechanically sheared at 1 x 10^6 per second. A value of 2.8 or is considered the minumum for normal bearing wear. Here are some HTHS numbers on well known oils, the higher the number the more shear stable the oil; 4's and 5's are excellent numbers and demonstrate basestock quality e.g. Silkolene and Motul.
Mobil 1 0W40 HTHS 3.6
Castrol RS 10w-60 HTHS 3.7
Castrol RS 0w-40 HTHS 3.7
Silkolene PRO S 5w-40 HTHS 4.07
Motul 300V 10w-40 HTHS 4.19
Motul 300V 5w-40 HTHS 4.51
Redline 5w40 HTHS 4.6
Redline 10W40 HTHS 4.7
Mobil 1 15w-50 HTHS 5.11
Silkolene PRO S 10w-50 HTHS 5.11
Silkolene PRO R 15w-50 HTHS 5.23
Motul 300V 15w-50 HTHS 5.33
Redline 15W50 HTHS 5.8
ROAD: Most semi synthetics are past their best between 3-5000 miles, synthetics are good for 9000-12000 miles on the road.
TRACK: Change periods will be determined by quality of the oil i.e. how shear stable it is under track conditions. A decent race oil will take about 10 hours of hard track use and a semi-syntehtic or hydrocracked base stock will last about an hour before the oil begins to lose viscosity.