This meant that every rider who won a senior race would also be the champion in their respective class and, with races reduced from 10 laps to just six, it added importance and intensity to each drop of the start gate.
As Steiner exited turn one, he had 3Twenty3 Kawasaki Team rider Josh Tredinnick for company; the two teenagers side-by-side as they ploughed through the muck, but, by the third corner Steiner was in front and with a clear view ahead.
The 17-year-old Tredinnick, from Tauranga, was unfortunate to drop his bike in a bog, the crash also tearing the cap off his radiator. His bike then overheated and forced him to withdraw.
This left Steiner relatively untroubled, in reality battling only the deteriorating track as the other competitors also struggled to stay upright.
"I knew I just had to stay out of trouble and I'd get the win," said Steiner.
"I think the secret was to stay smooth and not ride too aggressively in the mud. I love mud riding. Anyone can just twist the throttle when conditions are perfect, but it takes a bit more skill when it's this slippery.
"This was motocross at its toughest. This is what the sport is all about.
"It's always good to come here to this track and the club here did a great job of getting it prepared, especially considering the conditions today."
In other senior races on Sunday, Mangakino's Kayne Lamont won the MX1 class, Kakaramea's Ryan Gwynn won the 125cc class, Motueka's Roma Edwards won the women's grade, Gisborne's Johnny Edwards won the veterans' over-35 years class and New Plymouth's Mitch Rowe won the veterans' over-45 years class.
