Harley Davidson Motorcycles : About Using Slick 50 in Harley Davidson Twin Cam Engines

[raynemaeker1]

i read a story in popular mechanics on mobil one when it first came out. the engineer said he rebuilt his engine wrote down all the specs after 100k mi tore it back down and spec'd it again said it was like it only had 10k mi. on it. i used it right away and it caused my new car to leak oil. i used syn oil in my harley (bought it used but rebuilt) 1st oil change and my gaskets started leaking. some mechanics say it shouldn't have but it didn't leak a drop until i changed to synthetic.

[raynemaeker1]

I put slick 50 in my car when it first came out. after i drove it for 30 min like they said, when i pulled back in my garage, my idle had gone up from 900 to 1200 so i adjusted the carb back to 900 and it stayed there. to me this meant it had less friction so i was saving gas by being able to idle back the carb. i used it in several cars, never had any problem.

[HDfueler]

And in ANY case, the INVENTOR of TEFLON for Dupont did in fact resign after the Slick 50 debacle. When you read the principles and applications of Teflon, it is crystal clear that it absoluetly CAN NOT work as an oil additive.

[HDfueler]

If you read the "white papers" from ANY brand of ANYTHING, they will show you that theirs is the best. There's a guy on here throwing out that Amsoil makes his TF motors last longer-well, it KILLED mine. It's all in the luck you had with it, just like different brands of cars and bikes. For ME, the Royal Purple consistently out-performs the competitors both in cooling and longetivity.

[HDfueler]

I've been building Harleys since I was 13, and I'm 45 now. Licensed aircraft tech, master certified, and a world speed record holder. I know more about oil than most of the engineers at Ashland. So, here's the scoop:

Slick 50 uses Teflon and claims it increases engine life. Problem with that is, the engineer who INVENTED Teflon for Dupont RESIGNED after they sold it to Slick 50 because it CANNOT work. You can find his report online dating around 1996.

Royal Purple is what I use now. Try it.

[TheMILVET]

@HDfueler I use AMSOIL in everything I own. Become a preferred customer for $20 and 20W50 runs about 8 and change a quart. That is not " rediculously expensive" as KZ1000 said. No one's filters are more efficient and clean better. Remember, most oils are manufacture to run the recommended service interval, AMSOIL is made to exceed the recommended that interval. I run mine 7k because I can. Read their oil "White paper" 32 oils tested. I do not work for AMSOIL, I just know how well it works.

[cussedcreekforge]

Amsoil is what I use in everything, from the Peterbilt right down to my Harley. They make outstanding lubricants and I can buy Amsoil for my bike cheaper that H-D syn3. Filtration is key in extended component life. Amsoil filters are ahead of the game there too IMO.

[CrudeDude]

@cussedcreekforge You use it in your Peterbilt and your Harley? Works well on both tractors?

[Gary7even]

@jlescelius Mobil 1 is good and relatively easy to find. Amsoil MCV is good. I use Brad Penn syn blend in my twin cam 96.

[matrox]

What do you consider a lot of miles. I started using synthetic in my 04 1200c Sporty at my 20k mile service. Now have almost 23k miles. What is a lot of miles for a motorcycle?

[stockliskirep]

@matrox your bike is not a high miler...but if you chage to a syn oil...go Amsoil only ! Harley oil is nothing more then Citgo crap....and Gary7 is correct slick 50 was just an additive years ago Amsoil is the 1st and best out there! I run 60 wt Amsoil in my Panheads and we ran the race oil in out TF.700 Horse Power V-Twin Motors less bottom end rebuilds and the motors all ran a lot cooler! This guy had to be getting paid and sponsered by Slick ...to talk about it

[1EarthMother]

At first, I respected this guys opinion, but after viewing this one, I realize he's an idiot.

[mandaltby]

another retard...why would you bother hating harleys

I like all bikes you morn

[zombiehd2002]

Is slick 50 even still made, I know its a additive and NOT a brand of syn oil. I notice that he never mentions that changing to synthetic oils on higher milage motors cause oil leaks on motors that were use to standard oils. One thing i have noticed after working in motorcycle shops for years is that the harley transmissions dont last as long with the syn3 that harley recommends as they did with good old 80w90 semi-syn oil, i know people with over 100k on old oil in the trans and still going!

[Gary7even]

Slick 50 is not a "brand" of synthetic oil, it's an oil additive. When it was first introduced 30 years ago it actually had solid PTFE in suspension, which was not good for engines. It was basically snake oil with lots of unsubstantiated claims about what it could do.

While it's true that modern Slick 50 probably won't hurt your engine, any benefits from using it are dubious, IMO, and a waste of money.

[KZ1300Rider]

I'm a certified harley tech and I own my own shop now I got tired of all the corporate bullshit. I have proof that H-D syn3 is actually a worse lubricant than their conventional oil. On that same subject AMS oil is rediculously expensive. From personal experience I suggest using Lucas or Royal Purple.

[dragoncustomcycles]

@KZ1300Rider take a look at the ultima syn oil. its pretty amazing oil.

[Kward107]

umm no it's not

[stuntsnyc]

oh, ok

..it just seemed kinda strange, all that talk about keeping the "rubber down" and "lubrication", "performance", not to mention "strokes", stuff lke that, thought there was some sexual codes being used. not to mention he says "its not gonna hurt you to try it once" a well known quote guys use to talk women into anul sex. i still laugh when he says "keep the rubber side down" though.

lol

[Kward107]

biker lingo i suppose. but you just have a dirty mind that's all

[inpsychotive]

who doesnt use synthetic oils? are people really that clueless??? i suppose people actually use standard fuel also lol

[mdaljev1]

asshole!!!!! you don't even know what chainsaw is.

[mdaljev1]

thanks man, i have a question. can i use synthetic lubricant in a 50cc 4 stroke scooter? thanks in advance.

[mdaljev1]

Edit: Engine type is chineese copy of GY6, aka 139QMB.

[inpsychotive]

you should use synthetic oil with all engines.

[Netwirq2]

Thanks for the tip. I'm going to buy a chopper so I found this very useful. Thanks.

[lilsteps97]

FIRST!!!!