Commando,
need more info.
Did the fleet use the Lucas additive, or just Lucal oil?

As it happens I was at a local garage just now where there a Lucas oil demo-display with 4 gears on each side on the counter.
If you spin the gears fast enough you will notice the Lucas-side will hold airbubbles in the oil much longer than the regular oil on the leftside. Not really desirable in a high rpm performance motor I would think.
The Lucas-side also has noticable more drag while turning the gears.