You might want to check out the Weedeater website. I was able to find and download a manual for my Weedeater line trimmer from there. Don't know if they would have one on the lawn tractor, but certainly worth a try.
anywhere in the world
Try the WeedEater website (use Google to find it). I found a down-loadable manual for my line trimmer and my leaf blower.
What make of tractor? The best place to look would be in the box with the tractor when you bought it.
You can get it here:
Try searspartsdirect.com
http://www.poulan.com/poulanpro/manualSearchResults.do?requestedPage=2&&pagingMode=paged&&isRefresh=true
Th owners manual is at the link below, if that will help.
The owner's manual for the Sears Garden Tractor model number 917255910 can be viewed on the official Sears Parts Direct website. This is an 18 horsepower tractor.
Managemyhome.com with your model number
Go to www.searspartsdirect.com and put in model number 917272220 (that is the model number of the LT 1750 Limited Edition Lawn Tractor). Search for the owners manual. If you register with the sears website you can download an adobe acrobat file (.pdf) of the owners manual for free.
The owners manual states 3 pints (1.5 quarts).
More than likely SAE 30 weight synthetic. Your owners manual will list the recommended oil.