Originally Posted by bmcgc

After runing Hondas for 30 years this is a little different.

Everyone has an opinion on oil.

On my Hondas I ran Rotella 15/40 winter, 20/50 summer. Oil change interval was 8000 miles, I used the biggest filter that I could fit on the bike, Supertech if possible.

Engine oil change interval on HDs is 5000 miles, 10,000 miles on tranny/primary.

On my 09 EGS I will ride 10-15k a year, my wife will ride 5k a year on her 08 Fat Bob.

On my wifes bike do I change the tranny/primary annualy, or at 10k? At the end of year 1/5000 miles I could pull a sample and see what it has left in it. Rather than reinvent the wheel, Im sure someone has already looked into this.

This isnt about money. I have been riding and driving since 1974, I do maintenence when the manufacturer says to do it.

Before the flamers start in . I use Rotella oil, I use Walmart filters, I change engine oil when the manufacturer says to change engine oil.

Ive never had an oil related failure in anything Ive ever owned.

So my question is on tranny/primary oil. Annually or 10k?

Originally Posted by bmcgc

After reading through alot of threads its to easy not to change the tranny/primary oil at least annually.

I do have an observation on the various opinions that I have been reading about the oil issue:

Many guys post that they only use HD oil and filters because HD knows best.

Then in the next line they say that they dont change oil at the recommended 5000 mile interval, they change at 2000, 2500, 3000 ect.

So on one hand HD knows whats best when it comes to oil and filters, but doesnt know whats best when the oil should be changed.

Im just saying.........................

On my Chevy V8s I used a 2 qt oil filter. More oil = more heat dissipation.

Any choices for a longer filter on a 96ci FLH?

Are the filter threads 3/4 x 16?