AP Auto Racing Writer
CHARLOTTE, N.C. (AP) -- The third surgery on Tony Stewart's broken right leg was for an infection that "popped up" after the three-time NASCAR champion had begun walking a bit again.
Stewart underwent his third operation on Oct. 7, and said during a video chat Tuesday night on NASCAR.com that the risk of infection was something doctors had warned him about after his injury in an August sprint car crash.
"I was more worried about bones healing and skin healing," he said. "The doctor was more worried about infection and really said the first two months were kind of the critical time. We were at the end of that two months for the most part and, all of a sudden, a spot popped up that was infected and that caused the surgery last week. I went from starting to walk again, not great, not just walking around the house like normal, but I could take eight or 10 steps at a time, to having to spend the majority of the day again laying down."
Stewart is still on track to be back in the car for the season-opening Daytona 500.
During the chat, Stewart fielded questions from fans who submitted them through social media. He was asked what his biggest concern was before NASCAR's inaugural Truck Series race this year at the Stewart-owned Eldora Speedway dirt track.
"Weather. That was the one thing we couldn't control was the weather," Stewart said. "It's not like a pavement track where you can bring a jet dryer out and two hours later have the track back in shape. You are blowing mud around. If it rains at the right time, it puts you out for the whole night."
Asked if NASCAR would ever race Nationwide or the Sprint Cup Series on dirt, or at Eldora, Stewart said he didn't know.
"I never thought I would see the Truck Series there, the Truck Series proves that anything can happen," he said.
Stewart also said participation in the Coca-Cola's promotional Racing Family has helped mend relationships between drivers. He feuded with Joey Logano earlier this year, and Logano and Denny Hamlin are still not on speaking terms following a series of early-season incidents that culminated in a last-lap accident between the two at California in which Hamlin suffered a fractured vertebra.
All three drivers are in the Coca-Cola family, which requires several appearances together and commercial shoots.
"The outtakes are almost better than the commercials," Stewart said. "When you hear everybody talk about the Coca-Cola Racing Family, it really is a family. It's a family atmosphere. Even the dysfunctional family that we are with Denny and Joey and myself now, we are the three brothers that disagree sometimes. But still when we do this stuff, we still get along with each other, we still have fun, and we all forget about the stuff that happens on the race track.
"It's one of the few opportunities where we get to be around each other and not worry about racing."
BIG GOAL: Roger Penske isn't mincing words when it comes to the task at hand for Helio Castroneves in Saturday night's season finale at Auto Club Speedway in Fontana, Calif.
"Well, Helio's got to win the race, and it's a longshot," Penske said.
Castroneves trails IndyCar Series points leader Scott Dixon by 25 points going into the final race. The Brazilian had led the standings for 12 consecutive races before losing the lead to Dixon two weeks ago when his gearbox broke 10 laps into the second race at Houston.
In all, Castroneves led the points 14 of 18 races this season.
But he had a terrible weekend in Houston, where Castroneves had taken a 49-point lead over Dixon into the doubleheader. Then Dixon won the first race and Castroneves had a gearbox issue, and Dixon finished second in the second race when Castroneves had a catastrophic failure.
"We shot ourselves in the foot in Houston with the problem with the gearbox," Penske said. "He got a little wide with the 10th lap and the bottom broke the gearbox. To me, its reliability and that's one of the ways you win championships. We were good right up until the last weekend, and then we fell on our face."
If Castroneves doesn't rally, it will be the sixth time Penske has come up short since Sam Hornish Jr.'s 2006 title.
Penske said he won't hold it against Castroneves, who also came up short to Dixon in 2008 when Dixon beat him by 18 points even though Castroneves won the season finale.