I'm looking at an old Deutz 13006 tractor that specs 20W oil for both the trans and hydraulics, power steering too. Would Shaeffers Simplex trans/hydraulic fluid be a good substitute? Or, should I just find some 20W oil?
A typical 0W20 would have KV@40*C of about 50 cSt or lower, KV@100*C of 9 cSt or lower and adequate pp.
http://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/2811CF6C9F4AF94880257EC60063ED84/$File/BPXE-A2ZRHH.pdf
Price issue aside, I(being BITOG) would pick Simplex 115 for marginally stronger components protection with KV@40*C of 56-62 cSt, KV@100*C of 9.1-9.7 cSt and pour point of -37*C. http://www.schaefferoil.com/documents/17-115-td.pdf