At one of my local shops, I'm picking up Penrite 10w-50 for under $50 for a 5L bottle. I figure that's thin enough to save my car from the short trips I always end up doing and still being useful when I go someplace stinking hot.... With that wide a range of weightings, I do change every 5000kms, but every time, that oil is a beautiful colour... translucent and gently brown.