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On my "84" FXRT every third oil change I drain the oil tank, change the filter, fill the tank with oil (Mobil 1 20-50) then I have a Lockhart oil cooler on the front which I remove the outgoing oil line from then start the engine and let it idle until clean oil starts coming out. Then I shut the engine down and top up the oil tank.
There is a product called "Oil Scavenger" that allows you to remove about a quart of oil that remains in the sump. Their video looks good, I plan on buying one before my next oil change.
As for the oil, run some seafoam in the oil for 20 miles or so before you change the oil. It will break down the carbon deposits that are a normal result of any internal combustion engine.
There is a product called "Oil Scavenger" that allows you to remove about a quart of oil that remains in the sump. Their video looks good, I plan on buying one before my next oil change.
I can give you one case of Marvel Mystery Oil. I Had purchased a bike(brand intentionally not disclosed) that had been sitting for a couple years and had 4 carbs. I got the thing running but the carbs were varnished somewhat. The thing ran like dog poopy. I added a couple ounces of Marvel to about 2 gallons of gas and took it out and rode it for about 25 miles. As I rode, the bike started to run better and better until it was running smoothly. I was told about this stuff by an old mechanic, that swore by it. I've been using it now for over 40 years. I use it in my diesel truck and my car and my Harley. The can will tell you how much to use for a specific amount of gas or diesel. I use synthetic oil so I don't put it in the oil. I have also used Seafoam to remove water from my boat when it flooded the sump during a storm. That stuff really removes water from your oil!
I have been using the Scavenger system from Rogue Chopper for about 4 years. On a Softail it will remove 28 to 30 Oz. of nasty oil that would otherwise be left in your engine. It made a believer out of me the first oil change.
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