1999 CLK320 - Which Oil

[Andy11UK]

Hi All, this old chestnut, its due a oil filter change but not sure what to use I've been given a choice of 2 both fully sym 0w-30 or 5w-40 Looking through its early yrs it had 0w-30 at the dealer but the last few yrs the sh just says oil change at an indy so no idea whats in it, its uk based 81K and a 1999 3.2, I've also been told the 0w-30 is the better one as its thinner when hot and flows better and mpg providing the engines good (I hope it is), I do 3/4 motorway the rest mixed 12K at yr, had the car for a few months so no idea how much it uses, The book says use the correct MB spec and the oil makers look up guides point to 10w-40 semi which I don't think is correct, Any thoughts? its as clear as mud, cost is the same so it whats best,

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[john.m.gemmell]

For me it basically comes down to ensuring MB has approved it, they put it through lots of tests and have stringent requirements. Mobile 1 is my choice it has MB-Approval 229.3 and 229.5.

http://www.mobil1.com.au/products/product_0W40.aspx


Both Mobile 1 0W-40 and 5W-50 are fine. I live on the edge of a desert so I use 5W-50 cause its got better viscosity at temp extreams.

Just remember any oil you use must have MB-Approval 229.3 and 229.5.

[dlbehrns]

Amsoil European. #1 in my book.