I should have said Mobil 1 but, some people don't want to spend the money. $50 oil changes are not for the faint of wallet. I run Delvac 1 5w-40 in the winter and Mobil 1 15w-50 in the summer. If it gets real cold up their try Mobil 1 0w-40.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200