Quote:
Originally Posted by Billfitz
They're working from a script. They recommend 5w-40 because it has BMW Longlife-01 spec, 5w-30 does not, so they can't recommend it. If anything 5w-30 is better, as it has the latest API SP, ILSAC GF-6A specs. I'd be inclined to use 5w-40 in very hot climates, but not otherwise. Take into consideration this is all in my opinion. Ask ten people what their opinion is about oil and you'll get twelve answers.
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Hahaha that is true: “ask 10 people, get 12 opinions”
For the climates I live in São Paulo, Brazil. It’s tropical, so I can get 10ºC or less in a strong winter, and also around 35°C in the peak of summer or during some random hot weeks.
Would you consider this best fit for 5w40 then? Or still 5w30 goes better in your opinion?