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Transmission lube 99 Road King

Oil

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Old Feb 23rd, 2009, 11:41 AM     #1
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Transmission lube 99 Road King

Changing co workers oil this week. Going with Amsoil 20/50 in the engine but not sure on transmission.

What weight of transmission oil to you recommend?

What about Trans + in the primary -V- Spectro primary lube?

Bike has less than 10k miles on it and believe original owner used HD synthetic in all 3. Co worker has not changed oil since pruchase a few months ago.
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Old Feb 23rd, 2009, 12:12 PM     #2
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Re: Transmission lube 99 Road King

Quote: Originally Posted by 67hat34c View Post
Changing co workers oil this week. Going with Amsoil 20/50 in the engine but not sure on transmission.

What weight of transmission oil to you recommend?

What about Trans + in the primary -V- Spectro primary lube?

Bike has less than 10k miles on it and believe original owner used HD synthetic in all 3. Co worker has not changed oil since pruchase a few months ago.

GEAR oil in the trans, not engine oil. Mobil 1 75/90 or 75/140 will do fine as well as Spectro if you can get it. Formula+ is a good choice in the primary and spectro makes a good oil for the primary also. Your choice there.
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Old Feb 23rd, 2009, 03:06 PM     #3
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Re: Transmission lube 99 Road King

What is benefit of heavier such as 75/140 adverse to 75/90 or 75/110, all being synthetic. Some talk on other threas about the 75/140 being for 6 speeds since they have both strait and diagonal cut gears.
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Old Feb 23rd, 2009, 03:14 PM     #4
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Re: Transmission lube 99 Road King

Basically where the bike is being used as far as temps. I saw little difference if any between the 75/90 and 75/140
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