I'm using them on my Kubota zt with a Kawasaki. ST6607 fits the Kubota zg227 with their Kubota branded engines. Currently about $3.50 ,hard to beat.The Kohler and ST3614 are identical. The MP3614 has only minor differences with the silicone valve and metal end caps. The Super Tech MP3614 is my pick for my Kohler ZT740. Champion Labs is producing some quality filters.
I was using this machine yesterday with the same oil [May 2021] in the sump. Coming inside my wife and I immediately noticed that sulfur diesel oil smell. We don't get that reaction when I run the 2015 JD140 with the same oil, albeit I am farther from the exhaust and travelling much faster with that machine. So what are your thoughts? Is it the oil, or is it the rings and valve guides on that 37 year old B&S engine?Vintage 1985 Troy-Bilt Pony with 5 HP Briggs flathead. Purchased direct at the factory in Troy, NY over the winter of 85/86. In other words, not an MTD product.
Out: Rotella T6 5w-40 with 2-1/2 seasons; black as night in the north Maine woods. No complaints about that oil.
In: Rotella T6 15w-40. It's not as if this machine is ever getting started below 40 degreed F.
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John Deere 318 with an Onan P218g.
Out: 1.5 qt. Rotella 10W-30
In: 1.5 qt. Amsoil Small Engine 10W-40
Fram OCD filter was left on for another run. Got the deck off and blade put on for winter duty, just need tire chains and weights still.
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