Question about 2005 Harley Davidson FLSTN- FLSTNI Softail Deluxe

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What oil filter and air filter do you recommend for my harley 2005 flstn. How much oil goes in the motor, primary, and tranny

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I use nothing but OEM oil filters and I've installed a K&N cleanable air filter in all of my personal bikes and many of my customer's bikes over the years. You can't go wrong that way.

You Softail should hold three quarts of 20W50 synthetic oil in the oil tank. The transmission hold 20-24 ounces of the same oil and the primary holds 38-42 ounces of the same oil. Harley's oil is the Syn3 oil that it sells. You can use speciality oil in your bike as well. Some of the more popular brands are Amsoil, Royal Purple, RevTech, Mobil, Redline, and Golden Spectro. They are pricey and you need to go the company's website and check for the proper recommendations of their oil.

On the primary, I always stand the bike up and pour the oil in through the derby cover. If you look at the clutch assembly, you'll see that the outer hub is made of shiny aluminum. Just inside this there is a dark colored flat looking metal piece that is actually the clutch spring. Fill the oil no higher than the lowest point on this spring. If you fill it further, the clutch will drag.

As for the engine and the transmission, they each have a dipstick. The sticks have two marks on them. The top mark is "FULL HOT", and the lower mark is 'FULL COLD", Keep the oil level between these two marks. Never overfill.

Good Luck
Steve

Posted on Jan 02, 2011

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Posted on Jan 02, 2017

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there are other brands that surpass the syn3 oil but it takes some hunting around to find a supply.
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