Folks I know this has been talked about a few months back .I changed oil today on my Bx 2670, l let it drain about 3hrs and filled back up with Rotella t-6 5w-40 (new Kubota oil filter )and though the book calls for 3.7 qts I put the whole gal 3.788 in .My dipstick still shows about 1/2 way in...