Originally Posted by
Hodge
Funny story...
When I bought my 2009 CRD. I had a years worth of warranty and servicing included at the stealership.
It's first service, I got told that wrong oil was in the car. Whoever serviced it prior, used 15-40, which was stated on the Castrol servicing sticker (windscreen).
And that I HAVE to use 10-40W.
I put it down to, either are fine... I think he was maybe trying to twist my arm to only use genuine (10-40) from the dealership.
Anyways, I always used the 15w-40 magnatec on my 3L AND my 4.2 after buying that. Never had an issue that I know of.