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Transmission lube 99 Road King

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67hat34c

Active Member
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.
 
67hat34c said:
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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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.
 
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.
 
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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