The use rFactor Pro. Which is essentially a graphics engine with physics plugins. And no simulator uses ANY stock rFactor physics because they're awful. But it fools idiots into thinking that McLaren use rFactor on their simulator, and therefore that rFactor must be decent. Ha ha ha.
Oh okay.
Some mods out and about match most of what rFactor Pro is capable of, rFactor engine and rFactor Pro is somewhat the same. The license for rFactor Pro is something else and quite a margin more expensive as far as I'm aware of.
Most... In better words, all of the rigs I've visited around the world have used the rFactor base, so no matter how you want to put it, rFactor has better capability than LFS has. Standard rFactor is capable of EXACTLY the same that rF Pro has, It's all about getting the values right.
And no, I'm certainly not fanning Bose321, I'm simply throwing facts.