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Discussion Starter · #1 ·
I'm sure this question has been answered some where on here, but I'm asking. I have a 2006 SLK280 ~47k miles and I live in Northern California(Sonoma County) which never really gets that cold. What viscosity and weight oil do I need? I have looked in Owners Manual and it dosnt say. The Mobile One website recommened 0W-40. Any help here would be great!

Also, Has anyone tried the Royal Purple Oil 5w-30? Worth the $$$???
http://royalpurpleconsumer.com/product-categories/automotive/#!hps-motor-oil
 

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experts will chime in. also there should be a sticker in your engine bay on what to use.

i'd go with the 5w
 

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2005 SLK350
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MB issues approved fluids reports. Jeff's link called 'Motor Oil' to a discussion on oils has a reference to MB's approved oil list in post #7 . That list includes several Mobil 1 oils. It does not include any Royal Purple oils. The writer of that post also points out Mobil 1 0w-40 is readily available here in the US. I buy it at Walmart in five quart jug containers.

Oils not on the MB list may provide the proper lubrication and other benefits of approved oils. But then, maybe they won't.
 

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I'd agree with Jeff. In temperate climates 5W (winter) is certainly low enough in viscosity, and the narrower the range between winter and 'hot', the fewer viscosity modifiers comprise part of the oil, which theoretically means more 'oil', w/w. It could also be argued that more oil sticks to the metal/metal surfaces during frequent warm starts.
 

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As long as the packaging says it meets the MB Spec 229.5, go ahead and use it. I would not use anything that does not meet the spec.

As long as it meets the spec, 0W- or 5W- is up to you based on expected temps. I always used 0W-40 in SoCal and I continue to use it in NY.
 
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