Has anyone used Rotella 5W-40 (synthetic) in their diesel?  I recently came
across it in Walmart of all places.  I've been running Castrol Dieselall
10W-30 in my 1.6 n/a but it is becoming difficult to find.  Is it all right
to switch to synthetic in a diesel with 50k

Thanks,

Jeff

'82 Diesel Westy (52k miles)