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Timo Bernhard was quickest for Porsche in final practice at Spa-Francorchamps, 1.698secs up on the sister car of Neel Jani.
Bernhard posted a 1m 56.465s lap, as Porsche reasserted its position at the head of the pack after Toyota pulled off a surprise and was 1-2 in second practice on Friday.
Kamui Kobyashi led the way for Toyota in third, 0.164s off Jani, while Andre Lotterer put the #7 Audi in fourth, and the #5 Toyota finished up fifth, also suffering an issue at the end of the session.
The #8 Audi was again in trouble and after missing FP2 with technical problems, Loic Duval and the #78 KCMG Porsche 911 RSR made contact at the Bus Stop Chicane around half-way through the 60-minute session. Despite suffering suspension damage, however, Audi got the car back out, leaving the #8 R18 e-tron sixth, albeit 1.319s off the sister car.
In LMP2, Rene Rast was again best in the #26 G-Drive Oreca 05-Nissa, from the #35 DC Baxi Alpine and the #36 Signatech Alpine. Meanwhile, James Calado headed the GTE-Pro classification in the new #51 AF Corse Ferrari 488GTE, and Pedro Lamy was the pace setter in the GTE-AM class for Aston Martin.