Quick Newbie Lubrication Question

[tcb-1]

Gang,

Sorry in advance! I imagine this has been covered repeatedly, but tell me if I'm wrong please.

60 SAE for both engine AND gearbox lubrication?

or

50 SAE for engine, 60 SAE for gearbox?

[jdpan]

I think it depends on your location and time of year. You'll get a lot of different opinions on the topic and it's been covered several time so you might want to use the search function as a tool, it's also covered in the service manual.... I personally use 60 weight in the motor and 80/90 gear lube in the trans year round here in Texas.

[tcb-1]

jd,

I was still unclear since there was such a varying opinion on the oil types.

the HD manual says 75 SAE for the engine, but that sounded suspect. the manual didn't go into much detail about the gearbox lube requirements

[jdpan]

Pretty sure the general concensus will be 60wt or 20/50 engine and 60wt or 80/90 in the trans. Usualy, the cooler the temp the thinner the oil. Either will work..

[beets]

jd,

I was still unclear since there was such a varying opinion on the oil types.

the HD manual says 75 SAE for the engine, but that sounded suspect. the manual didn't go into much detail about the gearbox lube requirements

The 75 # is not a weight, but an obsolete HD numbering system.

[RUBONE]

H-D 105 is 60 weight, 75 is 40 weight, 58 is 20 weight.
Robbie

[kitabel]

It's not 75 SAE, it's 75 SUS.

[Bosheff]

To make things one step further....105 = SAE60 wt = Extra Heavy, and 75= SAE50 wt = Regular Heavy. Don't forget, percentage allowed for cling....bosheff

[JOHNSON]

50 wt motor oil in both works fine year around here in oregon,no probs,if i had hyd tappits,i mite run 60 wt if it gets hot,but leave the 50 wt in the tranny.just my opinion......and been doing this for 35 years,no probs..........have a good one....johnson