I have an old 1976 ironhead Harley Sportster which hasnt been started in 20 years. So I figure I dont have to worry about mixing types or brands of oil. Would you recommend Pennzoil 10w40 for a Harley as well? I would guess you are not a fan but it also appears you have overall motorcycle knowledge in general.
An ironhead will run long and happy with 20w-50 oil. Some people in hotter climates (ie the south) will run a straight 50w or 60w oil to keep it a little thicker because the motors tend to run slightly hot. If I was you I would just grab the nearest 20w-50 and go for a ride!