It is possible to do but so expensive as to be impossible.
F your site it sucks!
Briggs & Stratton part # 491056 NAPA filter # 1348
The 18hp Vanguard is a 570cc V-twin.
What is your Goal - Not pay Sears prices for an oil filter? I bought a NAPA brand oil (1348) filter for my riding lawn mower with a 16 HP Kohler for $6.
44oz
10W-30
SAE 30
What type of oil does a troy-bilt 6.5 hp push mower take
30w
SAE30
SAE 10w30 Synthetic oil.