A perceived home test track advantage at Queensland Raceway was converted by James Courtney into the quickest time during Friday's practice for this weekend's Queensland House and Land 300.

The Jim Beam Falcon was fastest in the middle part of three sessions and Courtney's time held up due to an oil spillage that prevented quicker laps in the final 50-minute session.

That oil belonged to reigning V8 Supercars champion Jamie Whincup who suffered a loss of oil pressure and was unable to post a representative time.

According to Mark Dutton, Whincup's TeamVodafone race engineer, the team had completed race simulation laps in the earlier stages but were unable to accumulate vital qualifying information when the problem intervened.

Luckily their home test track data, as well as that provided by team mate Craig Lowndes, shouldn't have too big an impact when qualifying commences tomorrow.

Another to suffer an engine drama requiring an overnight transplant was Paul Dumbrell who failed to register any laps at all in the final stint having run just a total of nine for the duration.

Otherwise it was a relatively incident free day with most attention centred upon the endurance co-driver session which began the day.

Multiple World Superbike champion Troy Bayliss cut his first competitive laps in a race environment during a 35-minute period headed by Warren Luff who was driving Courtney's Falcon.

"The day was another learning experience," Bayliss said. "I was out there with a lot of the guys from the main game and received a few touch ups to officially welcome me to the series.

"I would love to be able to stay out there all day but being here was just a chance to do a few laps and to let people know that I'm here and will be competing at Phillip Island and Bathurst.

"Overall, I think I need to spend a little bit more time in the car as each lap I did I got better and better and I feel as though I'm getting a good handle of everything - I just can't wait to get out there for my first race."

Courtney was pleased with his car's pace, particularly given the team elected to miss last week's test session. "The car wasn't flash straight away and we had to go onto our second set of tyres very early which isn't ideal," said the Gold Coaster. "At least it is consistent and comfortable to drive and I would have been even quicker had I not aborted a lap when I came up upon Lowndes.

"The bumps here seem to grow bigger every year but at test days you learn how to adjust your lines to drive around them. What we have to do is keep our eyes open and not make too many changes as the track is very much different when 30 cars run here compared to half a dozen during a test day. It's all cheery here at the moment but it could turn pretty quickly!"

Holdsworth was impressive given he was second fastest and quickest Commodore ahead of the factory Toll-HRT examples who were also beaten by Russell Ingall's SuperCheap Autos VE.

The young GRM/Valvoline racer admitted: "The tyres go off here very quickly but we can't jump to any conclusion just yet as Saturday is different and it will be hotter again. It is critical to be up there in qualifying and we will be looking for speed out of the car to tweak it more - maybe I should takes James' advice and drive around the bumps! I was on pole in Townsville and it is important to GRM to get wins every now and then so I'm looking for my next win."

Overall third fastest was the Castrol FPR Falcon driven by Steven Richards who had partaken of a recent exchange of information having driven the Stone Brothers Racing example here a few weeks earlier.

"We've done lots of things differently this weekend as we recognised we have been off the pace but this is the first Friday I've sat in a press conference and that is a good thing," said Richards.

"We have some data available from here as this is where the soft (Dunlop control) tyre was tested but I'm sure everybody has been smart enough to realise and analyse the same information. Running the SBR car I found the bumps hadn't changed much but some laps here beforehand are better than none at all."

On combined times from all of Friday's activities Ingall was fourth fastest ahead of last start winners Garth Tander and Will Davison (Toll-HRT), FPR's Mark Winterbottom, Courtney's team mate Steven Johnson, young Kiwi Shane Van Gisbergen and the Fujitsu Falcon of Jason Bright.

The three-stage elimination qualifying and Top 10 Shootout takes place on Saturday from 11am with a 33-lap race scheduled to start at 4:05pm. Sunday's 'all-in' qualifying starts at 10:15am with the 65-lap 16th round of the championship beginning at 1pm.