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What is better for the 02 WS6? 10W30, or 5W30, or any other recommendations?
"Made in Germany" Castrol Syntec 0W-30, always, regardless of climate. Better cold-flow properties to protect the car best at start-up and thicker than most 5W-30's and 10W-30's at operating temps. It's a true group IV synthetic unlike most "synthetics." Great oil, I love it.