well disitions disitions lol ok
gas better then oil
gti ones would probly be best but ......... look at it this way
the clue is in the name cabriolet ....... thats what ones you should go for lol
its not a Saloon, Van or Estate
The reason for using gas pressurization is to fight cavitation. When a vehicle is traveling down the road and hits a bump or a pothole, the compression and extension of the suspension telescopes the shock or strut. This forces the piston inside to push its way through a column of oil (hydraulic fluid), creating resistance as the oil is forced through small orifices in the piston. The motion of the piston also creates an area of high pressure ahead of it and an area of low pressure behind it.
It’s the low pressure area directly behind the piston that causes trouble because it allows tiny air bubbles to form in the oil (cavitation). The faster the piston pumps up and down, the more rapidly cavitation aerates the oil on both sides of the piston and churns it into foam. The result is a "foam zone" around the piston that offers little resistance and causes the shock’s dampening ability to fade.
That’s where gas charging comes in. Pressurizing the oil inside the shock with nitrogen gas prevents the formation of bubbles in the low pressure zone behind the piston.
How much pressure does it take? In a twin-tube shock, most manufacturers use about 100 to 150 psi, though some go up to as much as 250 psi depending on the application. The gas charge is located in the top of the outside chamber. With monotube shocks and struts, a floating piston separates the gas from the oil. Because of the larger surface area, a much higher gas charge is normally used: typically 360 to 400 psi. As a result, gas pressurized shocks and struts have more consistent ride control characteristics than nonpressurized shocks and won’t fade on rough roads or under hard use. Gas pressure also makes the shock more responsive for a firmer, more stable ride.