Reply With Quoteyou're not hurting anything at all cody but keep in mind 2 important things about lubricants:
1-up to 25% of a quart container of oil consists of the "additive package" compounds
2-tons of marketing jibberish and corporate-speak has always been part of the "lubrication industry" mainly due to the sheer size and volume of annual sales.
i'm not a particular fan NOR hater of H-D house brand Formula-3 oil. the actual history of it was as follows: Castrol company always supplied the factory fill fluids to H-D much in the same style that East Penn Manufacturing(think Deka/Big Crank) always has supplied the OEM batteries. and it's alot of volume because it involves factory fluid fills as well as dealer stock for customer sales and service. prior to the KC plant opening in late 1998 all H-D's were built across the river from me at the York plant. as per the plant production manager at the time "real PITA stocking all these assorted oils for both small and big-twins". so H-D corporate went to Castrol and asked for a specific viscosity and specific additive package for all temps as well as engine/primar/trans application. in other words their directive was "we want 1 oil and 1 oil only" to simplify everything. hence the formula 3 "one bottle does it all" oil. nothing wrong with it at all.....i just don't use it.
in all honesty cody with the exception of some crazy-assed fluids such as gear-lube or ATF.....i've used virtually every conceivable compatible JASO-MA rated lube you could think of in the primary. still to this day nothing and i mean nothing out-performs Amsoil 20wt-50 motorcycle oil in that cavity. great stuff!
Originally Posted by submax
