Copy & paste for the rescue:
Use SAE 5W-20 viscosity grade
engine oil for the 2.5L L4 engine.
SAE 0W-20 may be used as an
Use SAE 5W-30 viscosity grade
engine oil for the 2.0L L4 turbo
engine. In an area of extreme cold,
where the temperature falls below
−29 °C (−20 °F), an SAE 0W-30 oil
may be used. An oil of this viscosity
grade will provide easier cold
starting for the engine at extremely
When selecting an oil of the
source - http://www.buick.com/content/dam/Buick/n...al-2ndprint.pdf
I'd use 5W20 stating Dexos 1 gen 2.
The Chinese bought 990K Buicks last year. It's a popular brand in China. The average annual wage in the prefecture where it's manufactured
is the same as the cheapest buick a Chinese can buy new. It's not poverty central everywhere in China.