2004 BMW 1150RT leak in rear end (differential?) Need to know quicly what kind of oil to purchase. rider is on the road in St Louis MO enroute to ABQ NM. No helpful citizens. No one open. Please help. today is Sun 6/20. thanks so much

Page 7 right hand side. Specialized oils!

https://sgnauto.com/public/pdf/oil_and_lubricants.pdf

https://www.google.com/search?q=2004+Buick+Rendezvous+AWD+3.4L+oil+for+rear+end+differential+and+rear+transaxle

Service Manuals

https://www.google.com/search?q=2004+Buick+Rendezvous+AWD+3.4L+service+manual

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The closes Costco's to that address will be on 4200 Rusty Rd
Saint Louis, MO. https://www.costco.com/warehouse-locations/s-st-louis-saint-louis-mo-368.html

The leak is, as you say,is not from the seal it is from the press fitted parts on the gearset. Take the wheel off and you may find some oil in the central 'hole' on the bevel box. Maybe a previous owner used to much heat changing the bevel box large output bearing previously? The bad news is you will need a replacement final drive (plenty of good ones on ebay). All R11XX bevel boxes are interchangeable, although there are differences in the drive ratio (stamped near the breather). Having said all this, I do know of someone who stuffed a sock into the central hole to soak up the leak and carried on for another 6k!

i suggest you check the seal and output shaft again , also see if youve lost any oil in the diff housing on your rear wheel ! if ok then check the seal that connects to the driveshaft , but i wouldnt think this be the problem and its the output shaft area thats it !

Sounds like something broke loose versus running over something. There are very few "spare" parts inside a differential. But some have shims, there are rollers in the bearings, and teeth can chip. Depending on whether you have a standard differential or a limited-slip style gives you more or less parts.

What you do not want is an axle shaft sliding out of the axle tube or loose parts breaking more internal parts. There is a possibility that visual inspection inside the housing once the differential pan is removed will give a clear indication of what broke.

But to be totally sure, even with a puncture from road debris, you need to know if teeth are chipped. You also need the proper replacement lube for your style of differential.

There is a very remote chance that full coverage car insurance may consider this Road Hazard damage. You would need a Certified Mechanic or Dealership to take your side.

CarSmart 7921 Watson Road, Marlborough
(314) 968-9496

or Autotire,, ( go to this link for a 10 dollar coupon :)
http://find.mrtire.com/Chevrolet-Repair/MO/St-Louis
on that link you can locate them, or schedule an appointment

Yes, is the short answer to your question. The BMW R1150RT engine will run and be protected quite well using a quality oil of viscosity listed in your owners manual. I would suggest a 20W50 for most applications.

put flat pan under the housing remove the bolts holding the cover usually 10 or 12 (1/2 or #12 metric) bolts? allow the rear end grease to drain... then scape off the old gasket clean with brake cleaner spray install either new gasket or form one with oil resistant silicone put the cover back on , dont refill the fliud for at least 12 hours if using silicone. Also check the front driveshaft rear end yoke seal....they sometimes leak making the illusion of a rear end pan cover leak...if that is leaking you remove the shaft carefully...remove the large yoke retaining nut, replace the press in seal...be sure retaining yoke nut is properly torqued when reinstalling .

Parts Dist Cititronics / Panason St Louis Mo
1 800 846 2484.

please give me a rating for this info.
thanks
daniel.

I have the standard trunk (supplied by BMW for 1150RT for a hefty price). Nice thing about it is that it fits nicely, has a backrest for the passenger and is very stable and strong. The poor thing about it is that it still will not fit a helmet. I suggest you also look at the GIVI trunk. I don't know how it will fit to the 1150RT, but I do know they look nice, are well made and large enough to accomodate a lot more thant the BMW trunk. By the way, how do you like your 1150? I love mine. If only I had more time to ride it.