Oil Archive (no new posts) An archive of oil related questions and comments.

synthetic oils

 
Thread Tools
 
Search this Thread
 
Old May 4, 2008 | 05:43 PM
  #1  
fatboy1729's Avatar
fatboy1729
Thread Starter
|
Road Captain
15 Year Member
Liked
Joined: Aug 2007
Posts: 602
Likes: 12
From: Ma.
Default synthetic oils

Is it true you can use the same synthetic oil for all your engine fluids instead of one for the primary,tranny, engine?
 
Old May 4, 2008 | 08:36 PM
  #2  
pococj's Avatar
pococj
Seasoned HDF Member
20 Year Member
Liked
Loved
Community Favorite
Joined: Dec 2004
Posts: 11,068
Likes: 1,478
From: Texas! Ya mean there's someplace else?
Default RE: synthetic oils

ORIGINAL: fatboy1729

Is it true you can use the same synthetic oil for all your engine fluids instead of one for the primary,tranny, engine?
Yes, but it isn't the wisest choice.
 
Old May 4, 2008 | 09:59 PM
  #3  
itileman's Avatar
itileman
Outstanding HDF Member
Joined: May 2007
Posts: 2,561
Likes: 3
From: Billings, MT
Default RE: synthetic oils

Good question. I'm about to do my 15k service & the bike (bought it used last year) has always been run on Syn 3 in all 3 holes.
Giving some serious thought to at least beefing up the tranny oil weight for the summer. Any suggestions would be appreciated (at least on my part) - there are lots of suggestions in prior posts and it's a bit confusing sorting all through it.
 
Old May 4, 2008 | 10:36 PM
  #4  
smitty901's Avatar
smitty901
Seasoned HDF Member
Veteran: Army
15 Year Member
Liked
Community Favorite
Joined: Feb 2008
Posts: 23,003
Likes: 11,441
Default RE: synthetic oils

just because you Can does not make it a good idea.
HD is NOT a Honda the transmission is a true gear box.
Question would you put gear lube in your engine NO
Then why would you put oil in your gear box.
Read up on the lube thread lot of good ways to go there are a lot of good 100% true sny out there to meet your needs
SNY3 is at best an ok oil not a true sny
 
Old May 4, 2008 | 10:59 PM
  #5  
itileman's Avatar
itileman
Outstanding HDF Member
Joined: May 2007
Posts: 2,561
Likes: 3
From: Billings, MT
Default RE: synthetic oils

Thanks for the info. I'm surprised that HD doesn't sell a heavier grade syn for the tranny.
 
Old May 4, 2008 | 11:44 PM
  #6  
KBFXDLI's Avatar
KBFXDLI
Big Kahuna HDF Member
Joined: Feb 2006
Posts: 23,881
Likes: 34
From: USA
Default RE: synthetic oils

ORIGINAL: itileman

Thanks for the info. I'm surprised that HD doesn't sell a heavier grade syn for the tranny.
Me too. But many dealers have carried BelRay 85w140 gear saver for years. Any 75w90 or 85w140 GL5 gear oil will work fine.
 
Old May 5, 2008 | 09:01 AM
  #7  
Road King Craig's Avatar
Road King Craig
Cruiser
Joined: May 2006
Posts: 167
Likes: 1
From:
Default RE: synthetic oils

guys,
Puttin Amsoil svg75w/90 in the tranny, and Amsoil 20w/50 in the other two, Feedin My girl the BEST !
Tj
 
Old May 5, 2008 | 09:49 AM
  #8  
fatboy1729's Avatar
fatboy1729
Thread Starter
|
Road Captain
15 Year Member
Liked
Joined: Aug 2007
Posts: 602
Likes: 12
From: Ma.
Default RE: synthetic oils

Thank you for all of the replies. I never really thought about the different weights and grades. Thanks again. Ray
 
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom

 Verdad Gallardo
story-1

6 Weirdest Harley-Davidsons Ever Sold to the Public

 Verdad Gallardo
story-2

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-3

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-4

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-5

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-6

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-7

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-8

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-9

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
Old May 5, 2008 | 09:52 AM
  #9  
UltraDuke's Avatar
UltraDuke
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,136
Likes: 3
From: Parts Unkown
Default RE: synthetic oils

Redline synthetic in the engine, MTL for primary and Heavyshock for the tranny.
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jd8181
Oil Archive (no new posts)
10
Jun 25, 2010 09:54 PM
rainbowtawas
Oil Archive (no new posts)
5
Jun 26, 2008 01:32 PM
UltraKla$$ic
Oil Archive (no new posts)
11
Sep 6, 2007 02:19 PM
mndemohead
Touring Models
9
Jun 1, 2006 04:06 PM
Meinbmw
Exhaust System Topics
24
Jul 28, 2005 04:12 PM




All times are GMT -5. The time now is 11:09 AM.

story-0
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom

Slideshow: Killer Custom's latest build relies on styling changes rather than performance upgrades, giving the cruiser an entirely different personality.

By Verdad Gallardo | 2026-06-03 18:28:05


VIEW MORE
story-1
6 Weirdest Harley-Davidsons Ever Sold to the Public

Slideshow: From military-inspired singles to scooters and three-wheel utility vehicles, these Harleys took the company far outside its comfort zone.

By Verdad Gallardo | 2026-06-02 18:34:10


VIEW MORE
story-2
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-3
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-4
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-5
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-6
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-7
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-8
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-9
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE