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Ford Falcon: Which oil is best?

My AUII Ford Falcon Forte six still runs like a dream after doing 400,000 km. I have always used 10w/30 engine oil, but I see some oil retailers recommend 15w/40 oil on their website for my car. Would that harm the engine?

No, but I would stick with what you've been doing. You've had a great run, why change now.

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