If you were to mix 20w 50 weight with say..5w 30, would you expect an end
viscosity somewhere proportionate to how the ratios were 'blended'?  I
inherited a bunch of oil, mostly pretty light weights...like maybe 5 cases,
ranging from 10w to 10-40 and straight 20 and 30w.  I like to run about 15w
40w in my inline Jetta motored van and I change it out at 3000 (+/-)
miles...With all this light weight oil kicking around, I would like to just
buy some heavy oil and mix in a quart or two of the lighter free stuff...Use
it up...
  Acceptable?
Don Hanson