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20w50 synthetic
20/50 for most temperatures.
Four quarts. It may not use all of four quarts, but close.
SAE 10w30.
20-50w
Acetevo 10W-40
You should change your plugs and use lucas oil....
10w30 or 20w50 is great
use SAE30 oil Recommended for use in veteran, classic and vintage cars, motorcycles and tractors which do not have the full flow type of oil filter. It is a low dispersant oil which allows the combustion chamber contamination to drop harmlessly into the sump
The recommended viscosity grade for use in all temperatures is SAE 20W50 for your 2008 Heritage
I use Harley Davidson 20w50 in my 2003 883 and in my 2005 wide glide. Bel Ray also makes good oil for v twins, alot of my freinds use it. Also, you will need one quart of Sport-Trans for the primary/transmission oil.
Dextron