Thanks for your input--I have been using 20-50W for years-doesn't mean I was "right" in doing so--you reccomend 10-30w--other reply says 5-30 or 0-30. Also you said I should flush and hinted I may get leaks--*sigh*--I hate leaks--as far as using 20-50w--I really am not sure how I started doing that--since the oil is supposedly at 20w when cold, I assume that "light" weight part would begin lubricating quickly-and viscosity would reach heavier weights only as engine heated up. At this point, I am just going to have to "take a chance"-maybe flip a coin as to what weight Amsoil to go with when I make the change-next part is to find best price--looks like around $8 a quart--give or take a few cents--is what I have to expect to pay. I usually buy either the higher end filters of Fram or Purolator---Volvo--heard there are better--some filter is supposed to filter out one micron--any suggestions on that? Any advice on synthetic oil additives?
btw-Thanks to the Bricksters-I found my flame trap--was really easy to change on my '89--right on top towards the back of the engine--about a 2 minute job--it was actually relatively clean in spite of using "dino" oil---but I had the new one in my hand-so what the heck--(the Volvo parts place I use regularly gave it to me at no charge.) May the "Great Volvo God" be with us all!