I fit aftermarket lawn mower filters on all jobs unless a customer specifies a genuine one, they are paying the bill.
Mower filters do not diretly interchange with car filters they are designed to run at much lower volumes & pressures and usually are a far coarser mesh size than auto filters.
ompanies like Stens & Rotary do a full line of mower filters , they go about 1/2 to 2/3 the price of genuine filters and won't void the warrantee.
Usually I fit either Stens or Gripskie filters, around 200 /pa and never had a problem originating from them.
Stens claim they are OEM sourced & Gripskies sell either local made or rotary for some of the smaller volume runs.
Hydro filters are a different matter and usually I go genuine on them.
While there has only been 3 warrantee jobson trannies, 3 is 3 too many when thy all got traced back to the aftermarket filter.
Most private use ride ons only ever get 1 replacement so it is not a big impost on the customer