Question about 2006 Harley Davidson FLHR Road king

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If I use synthetic in my primary how often should it be changed?

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You may want to follow the standard changing intervals just so it is easier. With synthetic oils you will benefit from better lubrication, cooler temperatures, longer transmission life, and if you desire longer intervals between changes. You could just change as needed shorter intervals city driving and much longer intervals highway driving , much like motor oil. Or set a longer interval to follow for the transmission change. The manufacturer usually gives you recommendations in the owners manual , unless you keep a chart it is just easier to follow that recommendation. Besides, oil is cheap compared to your bike. More changes are always better than less changes.

Posted on Sep 16, 2010

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2009 Harley dyna fxdc,was going to change the oil,but I'm not sure weather to use synthetic or regular 10w40?and why do a lot of people say that you need to remove the derby cover?


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Oil capacity and regular or synthetic//


If changing your filter as well as the oil, your bike should take three quarts of oil as best as I know. Always check your oil using the dipstick when you change it. Change the oil and filter and add three quarts, start the engine and run it just a bit, two or three minutes. Check the oil level with the dipstick. The dipstick has two marks on it. The upper mark is 'FULL HOT" while the lower mark is 'FULL COLD'. Make sure your oil level is between the two marks and never overfill.

As for regular petroleum based oil or synthetic, you're 2001 machine came from the factory with H-D's Syn 3 20W50 synthetic oil in the engine, the primary, and the transmission. I'd recommend sticking with the synthetic oil but it must meet H-D's specification. Not all synthetics do. Matter of fact, very few do. Some that do is Amsoil, Royal Purple, and Mobil V-Twin.

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I have a big twin Harley. I use synthetic oil in the engine. I ride about 14,000 miles per year. I live in WI How often should I change oil.


It really a question about comfortability. Some folks change their oil(s) every 5000 miles (or more), some every 2500/3000 miles and some might do it as often as every 1000 miles. Depending upon the model year of your bike current H-D specifications recommend changing the engine oil, transmission fluid, and primary chain case oils every 5000 miles whether using conventional or synthetic fluids.

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1 Answer

Chanmge from conventional 20W50 oil to synthetic


Not a problem, I've done it on my '94 model Wide Glide. Your bike probably came from the factory with synthetic oil in it. Harley developed their Syn3 20W50 oil and the bikes are shipped with the stuff in all three compartments, the engine, the primary, and the transmission. Just check the manufactures website to make sure whatever oil you decide to use meets Harley's specs.

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1 Answer

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Harley-Davidson recommends their 20W50 petroleum based oil for the engine. You can use the H-D Syn 3 20W50 synthetic oil in the engine but I don't recommend it in the primary/transmission area. You can use any 20W50 oil as long as the API rating has a "C" rating for use in diesel engines. Look for the round circle somewhere on the container that had the API initials in it. It should say something like "SJ/CG". What you're looking for the "C" rating. If you wish to use a specific brand of oil, got to their website and look for their recommendations.

In the transmission, Harley recommends their Semi-Synthetic Primary and Transmission lubricant for Sportsters. The lube lubricates both the primary and the transmission on the Sportster. I don't recommmend full synthetic transmission lube on any bike built before 1995 as it will cause the gears to run noisey. In 1995, Harley changed the back cut on the gears and this made use of full synthetic lube more quiet running. Of course, you can use the full synthetic from a lubrication view point. It's just a bit noisey for my taste.

Whatever you use, make sure you go online and check the manufacturer's suggestion for use.

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2 Answers

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