Tractorguy1038
Bronze Member
So two of us recently bought G274's. Mine came with a NAPA 21521 oil filter and the other with a NAPA Gold 1334. My local NAPA dealer said they were not the same application. I did a little searching and found my 21521 has American threads ( 3/4 - 16 ) while the 1334 has metric threads which are nearly the same - 20 x 1.5 mm - which translates to .787" (larger than 3/4 or .750) and 16.9 threads per inch instead of 16. The gaskets vary a little in size also. So now to find out which I should use.