Steve Kolenda Posted October 27, 2008 Share Posted October 27, 2008 Recently sent a sample of final drive fluid from my 2000 R1100RT to Blackstone Labs. Received the report back today and the only thing that they noted unusual was the viscosity of oil appeared to be in the low 20W/50 range. My dealer changed the fluid the last time so I don't know if they used 75W/90 or 75W/140. Any suggestions as to why the viscosity would be low? Also with the analysis what other types of materials should I be looking for if I am concerned about the final drive failing? When I originally contacted them they told me "We actually have pretty good averages for this type of system, so if a problem is developing, we should be able to see it." I will give them a call tomorrow to see if they having anything to add to their report specifically regarding a failure. Link to comment
T__ Posted October 27, 2008 Share Posted October 27, 2008 Steve it sounds like they thought it was engiene oil.. Probably not too bad as gear oil & engine oil don't use the same viscosity scale.. A 75W-90 gear lube viscosity equates close to about a 15W-45 engine oil viscosity.. Twisty Link to comment
Steve Kolenda Posted October 27, 2008 Author Share Posted October 27, 2008 Could be, although their report states gear lube. I will ask them tomorrow. Link to comment
T__ Posted October 27, 2008 Share Posted October 27, 2008 Could be, although their report states gear lube. I will ask them tomorrow. Steve, well if they did rate it on the gear oil scale it is down a bit.. Maybe still not too unusual as anytime you run oil through a gear set under load it shears to a lower viscosity.. The more polymers in the oil & the longer it is run the lower the viscosity gets.. If it wasn’t a premium or synthetic gear oil to begin with & was run a fair amount of miles it can shear down pretty good.. Blackstone is a very good company so see what they say about it.. Twisty Link to comment
Steve Kolenda Posted October 28, 2008 Author Share Posted October 28, 2008 I called the folks at Blackstone today to inquire about the viscosity issue and thinking about the previous oil change which was done at the dealers (first time since final drive failure in 05,normally change myself) noted that the oil could have been 75W90 instead of the 75W140 that I had stated. They plugged 75W90 into their program and the results matched exactly. They also stated that the rest of the analysis looked very good. I will probably send off another sample in 12,000 miles or so. Link to comment
Fugu Posted October 28, 2008 Share Posted October 28, 2008 gear oil & engine oil don't use the same viscosity scale.. A 75W-90 gear lube viscosity equates close to about a 15W-45 engine oil viscosity.. Twisty Who would have thunk that? Not me. You, sir, are a veritable font of useful mechanical information. Link to comment
smiller Posted October 28, 2008 Share Posted October 28, 2008 Yes, of course the nomenclature is the same but the scales are different... after all, it's more confusing that way... Link to comment
billy bee Posted October 29, 2008 Share Posted October 29, 2008 Confusing, but it makes for prettier pictures... The artist here, I think, imposes a feeling of balance and symmetry upon an angry backdrop. A compelling contrast of fear and fairness. bb Link to comment
Recommended Posts
Archived
This topic is now archived and is closed to further replies.