WSR earned a clean sweep in the second British Touring Car Championship practice session at Brands Hatch, locking out the top three positions in the dying moments with Tom Oliphant fastest.
The new for 2019 BMW 330i M Sport has been strong out of the box during testing and Andrew Jordan went fastest in the first practice session of the season earlier on Saturday.
But it was his team-mate Oliphant who came out on top in the second 40-minute run, setting a benchmark time of 48.475 seconds to beat Jordan and Colin Turkington.
Oliphant set the early pace as the first runner to post a sub 48-second lap before he was toppled by Jason Plato - finally showing the pace that Power Maxed Racing had been confident of finding from the Vauxhall Astra.
But Oliphant responded immediately to go back ahead of two-time BTCC champion Plato.
Then, at the halfway point, a small rain shower forced most runners to switch to the wet tyres.
But Mercedes A-Class driver Aidan Moffat was caught out at Paddock Hill Bend as he tried to scrub in new tyres, ending up in the gravel to cause a red flag with 10 minutes to go.
The track was reopened for a seven-minute shootout and a flurry of cars headed out.
It looked as though Plato would retain second ahead of Team Dynamics's Dan Cammish, given the conditions.
But the track came to the rear-wheel drive cars and so as the chequered flag was waved Jordan eclipsed Plato to move second on his final flying run with a time of 48.574s.
Turkington followed suit, with his 48.667s taking all three BMWs to the top positions.
Plato held onto fourth ahead of the quickest Motorbase Ford Focus RS of Tom Chilton, who is just two away from scoring his 1500th BTCC point.
Tom Ingram had a slow start to FP2, but in the final minutes he set a time good enough to take the new Toyota Corolla into sixth for Speedworks ahead of Jake Hill, Cammish and Chilton's team-mate Ollie Jackson.
AmD Tuning's Sam Tordoff, who broke the qualifying lap record for the Indy circuit during pre-season testing, rounded out the top 10.
The 2017 champion Ash Sutton was 12th in his Subaru Levorg GT for Team BMR.
Matt Neal took the second Team Dynamics Honda Civic Type R to 16th ahead of Plato's Astra team-mate Rob Collard.
Ahead of his series debut, 1992 Le Mans winner Mark Blundell finished the final practice session in 22nd.
Nic Hamilton ended up 26th, while Moffat was not able to resume running after his off so did not improve on his 28th-place effort.
|4||Jason Plato||Power Maxed Racing||Vauxhall||0.399s||23|
|5||Tom Chilton||Motorbase Performance||Ford||0.483s||19|
|6||Tom Ingram||Speedworks Motorsport||Toyota||0.505s||21|
|7||Jake Hill||Trade Price Cars Racing||Audi||0.516s||27|
|8||Dan Cammish||Team Dynamics||Honda||0.606s||23|
|9||Ollie Jackson||Motorbase Performance||Ford||0.654s||25|
|10||Sam Tordoff||AmD Tuning||Honda||0.671s||23|
|11||Chris Smiley||BTC Racing||Honda||0.706s||18|
|12||Ash Sutton||BMR Racing||Subaru||0.717s||22|
|13||Stephen Jelley||Team Parker Racing||BMW||0.786s||22|
|14||Matt Simpson||Simpson Racing||Honda||0.831s||30|
|15||Adam Morgan||Ciceley Motorsport||Mercedes||0.867s||28|
|16||Matt Neal||Team Dynamics||Honda||0.871s||26|
|17||Rob Collard||Power Maxed Racing||Vauxhall||0.883s||28|
|18||Rory Butcher||AmD Tuning||Honda||0.904s||20|
|19||Jack Goff||Team Hard||Volkswagen||0.942s||26|
|20||Senna Proctor||BMR Racing||Subaru||0.989s||26|
|21||Carl Boardley||Team Hard||Volkswagen||1.059s||25|
|22||Mark Blundell||Trade Price Cars Racing||Audi||1.285s||17|
|23||Rob Smith||Excelr8 Motorsport||MG||1.375s||33|
|24||Bobby Thompson||Team Hard||Volkswagen||1.501s||16|
|25||Michael Crees||Team Hard||Volkswagen||1.576s||19|
|26||Nicolas Hamilton||Motorbase Performance||Ford||1.611s||22|
|27||Daniel Rowbottom||Ciceley Motorsport||Mercedes||1.827s||24|
|28||Aiden Moffat||Laser Tools Racing||Mercedes||2.016s||19|
|29||Sam Osborne||Excelr8 Motorsport||MG||2.077s||32|
|30||Josh Cook||BTC Racing||Honda||4.708s||11|