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- What is the best oil for a Harley transmission and primary?
I've kinda narrowed my choices down to trying either Redline or Amsoil in my 2002 Electraglide.I just thought i'd see if anyone has experience with either of these and what they thought.Also does anyone know of something better particularly for the transmission?Thanks in advance.

A Best Answer - Chosen by Voters My answers to similar questions............. As much I love HD....I hate to say it, but HD doesn't know SH*T about synthetic oil. For decades, they said not to run synthetic in their engines.....because of popular demand by the public, HD finally came out with their SYN3 synthetic oil several years ago, but it is honestly not worth a crap. THE BEST 3 SYNTHETICS FOR A HARLEY ARE #1-AMSOIL, #2-LUCAS, #3-MOBIL1(which is recommended by S&S). I have been working on HD's and building performance engines, drag racing and dyno tuning for 20 years and have been running Amsoil for years, but have recently switched over to Lucas because it is just as good, but a little cheaper. AND THEY DO NOT AND WILL NOT VOID YOUR WARRANTY FIRST OFF.........DO NOT RUN HD SYN3.....IT'S JUNK.........I AM A CERTIFIED HD TECH, AND I WILL TELL YOU FIRST HAND....HD DOESN'T KNOW JACK ABOUT OILS!!!!!!!!! For deacdes, HD said to never run synthetic in their engines, their reason....it will cause the bearings to "skate".........but ask anyone on the drag strip running a top fuel 800+ HP engine what they run.......FULL SYNTHETIC.......their bearings don't skate!!! By popular demand of the public, HD finally released their SYN3 back in the early 2000's......manufactured by Sunoco. SO........ Second......why would you WANT to go longer between oil changes?......esprcially on an Ultra, the baggers are subjected to to more engine strain than the other models due to their weight, plus they run hotter from not as much aie flow, that's why they have a larger oil tank to aid in cooling. FRESH OIL IS CHEAP INSURANCE AGAINST ENGINE FAILURE. Standard oil you should change every 2500 miles. You CAN go about 3500 on synthetic, but why? Scheduled PREVENTATIVE MAINTENANCE set by the factory are based every 2500 miles, IT IS BEST TO CHANGE YOUR OIL EVERY 2500 MILES....SYN or STD. Keeping up on the maintenace, prevents major breakdowns. It's btter to spend $400 or so a couple times a year than spend a few thousand to repair something that was caused by lack of maintenance. As the other guys have said, synthetic does make your engine run cooler and lubricates much better than standard oil. The best synthetic to run is 1) AMSOIL or LUCAS 2) Mobil 1 It is ok to run the same synthetic in the primary as you do the engine.......but NEVER use that same oil in the trans. HD says you can, but it makes the trans hard to shift and noisy......run minimum 75/90 gear oil......best if its 85/140......the absolute hands down best trans oil on the market is RED LINE full synthetic Shockproof 85/140...it will make your trans runs smoother, quiter and shift easier.

- what can i use in my harley transmission besides formula x?
sunday, today i wanted to go for a ride. thought id change the case oils before i set out. i had bought everything from harley several days before. that was 2 quarts of formula x and 4 quarts of motor oil. well i spilled the whole quart of formula x on the ground that was suppose to go into the transmisssion. now its sunday and harley is closed. my question is, what other equal replacement can i use that meets or exceeds harleys qualifications for this "formula x"? if you dont really know, then please dont answer this question, cause this is a 30,000 dollar bike and i am going to take some advice from you guys today.................thanks rick

A I use drag speciality for my oil.both primary,crankcase,and transmission.