HD Syn 3 oil

3k was a standard. Oils sucked back then machine tolerance was poor compared to today.

3k was perpetuated by oil lube placs to keep u changing meaning more revenue

Go by manuf instructions.


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Harley syn3 is a blend not a full synthetic oil.

Got a friend who said this.

Well I used it for 3 yrs 53,00 miles. After I traded it in I was in the back talking to the guys working on it and they ask me what the hell I did to cause so much damage, as in wear. Told them that I used Syn3 and changed every 2-3k not every 5k thats recommended. Oh thats why he said. "we can tell, whatever bike that uses that stuff, has premature wear." I ask about what HD says, and just like what was posted "they dont make oil, they buy the cheapest **** that meets their specs, then bottle it". Not one wrench in that dealership, says they would use that sh$t. Now they all used something different that each other, some SYN some fossel. The only thing they did agree on was not to use SYN3. Then on to the service manager, who is the best wrench around, and all he would do is quote HD and dance all around the Q. But he likes Mobile 1 syn V-twin. My guess is he likes his job. I quit using it right then. JM2C

Yea buying cheap Dino oil I would change it every 3,000 miles or less to.

New trucks and cars some have 0w-30 as the weight


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Old oil didn't have detergents, remember when that came out?

Thats why you changed it often, oil picks up a lot of dirt and crud, but the old
oil would breakdown and deposit that stuff in cracks cranny and crevices like
areas of gaskets that had broken down. (Base gaskets on shovels etc)

Guys would run Syn which was more apt to stay clean longer tolerate heat
and not break down, so it cleaned everything very well, so well it would
pull the crud out of the cracks, cranny and crevices like leaky base gaskets
and the bikes would leak, then the owners would blame syn on causing leaks
which in a way is correct, because it found the leak in the gasket that was plugged.

Bike had a leaky base gasket that was deteriorating already, but
now that hole was open. So leak.

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Detergents were started to be added back in the 50's I don't think most of us anyway were changing oil in our cars back then. When I was in high school and finally driving we used to change our oil every 4-6000 miles. That was in the car owners manual that I remember. Yep, oil has changed just like motors. With the new synthetics you do not need to change it at 3,000 unless you just simply want to. Just look at your Harley owners manual, it don't say 3,000 miles. That has been programmed into our brains for years. Yea I do change mine around every 4,000 but could and have gone longer using a full synthetic oil.