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  #1  
Old 09-10-2006, 10:57 PM
SDozier SDozier is offline
 
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Default Primary Oil Change

What is the "standard" time / mileage for changing the Primary Oil? It appears there are a lot of choices as to what to use. I guess I will use Mobil I 20-50.

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  #2  
Old 09-10-2006, 11:22 PM
HogBoy HogBoy is offline
 
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Default RE: Primary Oil Change

I'd suggest checking your book to see since it varies by model. A service manual is a great investment.
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  #3  
Old 09-10-2006, 11:28 PM
MACK MACK is offline
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Default RE: Primary Oil Change

HD PRIMARY IS GOOD. 5000 MILES
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  #4  
Old 09-10-2006, 11:30 PM
xxxflhrci xxxflhrci is offline
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Default RE: Primary Oil Change

Just go by the owner's manual. The primary oil change is the least critical of the three holes. The primary oil is nothing more than an oil bath to lube the chain. The product used in there doesn't have to be that high tech. Some guys use ATF, some regular motor oil, some high buck stuff.
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  #5  
Old 09-11-2006, 12:14 AM
billnourse billnourse is offline
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Default RE: Primary Oil Change

Standard HD Primary oil works good. Some oils are not good because of clutch issues, and the clutch is in there. I change mine every 5,000 miles.
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  #6  
Old 09-11-2006, 09:52 PM
pilot1996 pilot1996 is offline
 
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Default RE: Primary Oil Change

I've been using the HD stuff, though I have been looking for a cheaper oil that does the same job...another thread suggested Drag Specialties stuff, supposed to be just as a good, buck and half less. I change mine every 5K as scheduled in the maintenance manual when I change all the others.

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  #7  
Old 09-11-2006, 10:10 PM
SDozier SDozier is offline
 
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Default RE: Primary Oil Change

Looks like a wide variety of choices with oil changes at or before 5,000 miles. Thanks for the help.
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  #8  
Old 09-11-2006, 11:32 PM
glide glide is offline
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Default RE: Primary Oil Change

Change it when you do the engine oil, it's only less than one quart in the primary. Most any 10/30 or 10/40 NON synthetic oil will work well in there. Synthetics can cause some clutch slippage.
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  #9  
Old 09-11-2006, 11:35 PM
glide glide is offline
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Default RE: Primary Oil Change

.
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  #10  
Old 09-14-2006, 10:19 AM
Hackd Hackd is offline
 
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Default RE: Primary Oil Change

Quote:
ORIGINAL: xxxflhrci...The primary oil change is the least critical of the three holes. The primary oil is nothing more than an oil bath to lube the chain...
I don't agree with that.....Of the three fluids I would put the primary at number two behind the engine oil. Once the tranny has 5000 miles on it, you pretty much can ignore it...If you are looking to limit cost on fluid changes. Run a decent synthetic oil in the tranny once you've got 5-10k on it, and change it out every 10K or so. Again, this is if you're trying to limit cost. My tranny goes every other change because I was using semi-syn oil in it. I've since swapped to Mobil 1 75-90, so I'm gonna increase the change interval to every third or fourth oil change. I do notice a small change in noise levels with the Mobil 1 over the HD semi-syn oil.

The primary 'oil' also bathes the clutch and regular changes helps flush out any crap from the discs. And different models require more (or less) oil. My 93 Evo Electra Glide uses 42-44oz in the primary. I 'normally' change the primary oil when I change the engine oil (somewhere around 2500-3000 miles). But on occasion will go every other engine oil change, depending on how I racked up the miles. I'm presently using Formula+ in there after 47,000 miles of regular HD Primary oil. I don't notice much difference between the two. I just might experiment with a synthetic once I use the last of the Formula+ I've got on the shelf. But I'm also looking at cost and not having to 'stock' a bunch of different oils, so when I swap the motor (just got the top re-done) over to Mobil 1 V-Twin, I might try it in the primary also.

Just my .02.
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