living in Brisbane I use Nulon 10w40, so called fully synth. A lil better than OEM 10w30. For DC2 use similar viscosity and change regularly and u'll be fine.
Do not use 15w50.
In regard to OP, if you switch from 10w40 to 5w30, you may get some oil seepage (sump gasket/other seals)that wasn't there before due to thinner oil
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