The only caution I would add to the use of multi-weight is try not to cover a wide range of parameters with one oil. The buffers/medium that enable one oil to behave well from low to high temperature extremes does not contribute to lubrication themselves. Also, this is the substance that is first to 'coke-out' when exreme temperatures are encountered. In other words, instead of using 0-50w, try 10-30w or 20-40w. Most aircraft oils encounter some pretty high temps since the engines are air cooled and find themselves in some pretty tight cowlings so a great deal of pilots prefer a straight single weight, such as 80 in the northern climes and 100 in the south. This lessens the chance of oil breakdown. FWIW.