...Personally I find the smell of partially-burned nitro fuel and castor oil much less offensive than the smell of partially burned gasoline and motor oil.
When I used to do a lot of riding I LOVED the smell of CAM2 or high octane race fuel on the trail. Smelled like fresh laundry, made you want to ride faster, smelled like SPEED! Haha! Then some of the guys who rode two-smokers started using a scented oil mix. It was kinda funny riding along and all of sudden you smell a dude's grape- or berry-smelling CR250R dirt bike. LOL.
Got the old associated t4 out for some work. Replaced the crappy x-car 120a and 3900kv combo in it with a viper vtx10r black edition and 6.5t motor, and a turnigy tgy-t168hv 16.8kg servo.
Not very often I say this, but it might be a bit overpowered...
Ha! This inspires me to fire up the old XXX-T MF1. But right now my 8.5T Novak combo I ran in it is sitting in my 2wd Slash with paddle tires... aka. beach mode.
On Road: Tamiya & XRay
Off Road 1/10: Losi & XRay
Off Road 1/8: Mugen