Quads are pretty dangerous, especially if you drive them like you stole them, which maybe a former GP racer might do. They are utility vehicles and need to be driven as such. Especially with the newer ones, which are too heavy to not injure you if they end up on top of you.
'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]