Yeah, it's for these reasons that several vendors market what is essentially the same valve oil with different viscosities. Yamaha, for example has "Light valve oil", "Regular valve oil", and "Vintage valve oil" (the "vintage" part refers to the instrument and not the vintage of the oil as in "that's a fine 2012 Yamaha valve oil you have there, with excellent bouquet and finish"). Currently I do not use the Regular. For my Wessex EEb tuba and my Mack Brass euphonium I use the Light. For my "vintage" 1924 Buescher Eb tuba, I use the Vintage.
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)