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Recently did a 11 000km (7500 mile) oil interval on Castrol 5w 30 C3. UOA came back perfect. Previous UOA on 5w 30 also came back good. Previous UOAs on toyota 0w 20 also were fine. The Euro spec castrol keeps my oil pressures in the 50 psi range while the 0w 20 hit the low 40s at 118 C (244 F). Car is stock with bouts of spirited back road hooliganism but not winter driven.
I would definitely NOT use an additive, no way, no how. Used Oil Analysis is cheap insurance. Oil Temp and pressure gauges are nice for piece of mind and look cool.
Do a UOA on your 0w 20 and see how it's holding up, then decide.
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