Monitor your engine oil temp. It's prob not much different than mine so there's not much advantage going thicker oil. One grade higher perhaps as the engine wears but too far off factory spec you risk affecting vanos.

You def shouldn't need W (winter) viscosity so I would be curious what people in hot climate have experienced with straight weight oil. SAE 30 or 40 no W for cold temp start

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)