I have heard from a trusted friend that horizontally opposed engines run a little hotter then "V" blocks. He told me he wouldn't use anything less than 10w 40 (in a wrx) and that here in Raleigh (summertime temp. around 92-99f) I should use 20w 50 in the summer and 10w 40 in the winter. He also said that when he was a mechanic for Richmond P.D. (1970's) that they used Havoline oil. "You never saw a cop car broken down on the highway have you?".
I really don't want to turn this forum into a flame/personal oppinion hotbed, I just don't want to hurt the car.
Any help would be greatly appreciated