Diff and engine oil

Think 75w90 fully synthetic gear oil for diffs and gearbox and 10w40 upto 10w60 fully synthetic engine oil depending on how you drive.
Ive heard 10w40 is best for mainly short distance runs and the higher grades for harder driving etc
 
I drive an Impreza myself and use motul 10w50 engine oil.
Once what you use is good quality fully synthetic you'll be grand.
 
A bit of an old chestnut this one, I rang a number of Subaru Garages to ask what oil to put in my 2002 sti and all use 10W40 semi synthetic i cahnge it every 3500-4000 miles. As long as it meets the spec in the owners manual you will be fine.
 
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