If your oil temps exceed 120C often then you may want to fit an oil cooler (thermostatically engaged, so it won't keep the oil from warming up quickly)
If they reach 140C then you absolutely need one
After the turbo bearing the oil is very frothy and in a bad state as it returns to the sump, so that doesn't help.
With turbos I've only ever used good synthetic oils and keep changing them very often, especially after hard runs.
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