Back in the day front struts were not gas charged and could be disassembled and then re-assembled using heavier oil. When I did this on a Capri for use in autocrossing I used motorcycle fork oil. You only needed to increase the weight of the oil by a small amount to see a big increase in dampening. I had a friend that thought that if a little is good, more is better and blew out the seals of his struts when he used 50w fork oil instead of the 10 or 15w oil I used.
Modern struts are sealed from the factory so this options is no longer possible.
"Drag racing is for those people who don't know how to down shift and brake at the same time. "
DD '12 VW Jetta TDI, Race car '87 ITA 16V Scriocco
Cars owned: '86 Mustang GT, '92 Mustang LX, '93 Mustang Cobra "R" #58