Anyone tried thicker oil than OEM?
 

I have just changed my oil in my 2002 M5, and with the extra oil I bought (three 5 liter containers), now contemplating putting 10W-50 oil in my 2.5l 2004 X3. Other than the possible lowered fuel economy due to added resistance, what does everyone think about this approach?
:iagree: OR:fired:

its summer, so it doesn't matter does it?

Run what the factory says to run. there's more than one reason to do so.

The book says 5W-30 or 5W-40. I don't recommend bumping up to 10W- anything, the engine may not like it. I run 0W-40 when I buy the motor oil myself for the "in-between" oil changes.

Been flogged to a pulp, here...
run whatcha like.

I doubt that oil is going to make the M5 blink, but one might miss
the "5W" part in a Montreal January.

From the Front Page of This Site, a good oil info capsule by
a knowledgeable poster, "withidl" : Lube 101.
Worth a read, even if it is slightly more than text message
in length, ;>)
GL,mD

http://www.xoutpost.com/articles/x5/m...ion-101-a.html

Its multi viscosty, it shouldn't make a difference, summer or winter.
cheers
vern

Oops, I voted before I saw you were in Montreal.

I doubt it gets hot enough up there to be needed. The recommended oil should be fine.