"Simply put, Mr Massa is the rightful 2008 Driver's Champion, and F1 and FIA deliberately ignored the misconduct that cheated him out of that title," said the letter.
There was no immediate response from the FIA and Formula One, which is currently on an August shutdown.
PIQUET CRASHMassa was leading the 2008 Singapore Grand Prix from pole position when fellow Brazilian Piquet crashed into the wall on lap 14 of 61.
The lawyers' letter warned that, without a satisfactory response, Massa intended to "pursue legal action in order to seek compensation for the harm he has suffered."
Massa did not win again after 2008, with the Brazilian suffering a near-fatal head injury at the 2009 Hungarian Grand Prix.
Persons:
Driver Felipe Massa, Hamad, Mohammed, Massa, Ecclestone, Felipe Massa, Stefano Domenicali, Mohammed Ben Sulayem, Law, McLaren's Lewis Hamilton, Mr Massa, " Massa, supremo Bernie Ecclestone, Max Mosley, Nelson Piquet's, PIQUET, Piquet, Fernando Alonso, insider.com Ecclestone, Hamilton, Mosley, Charlie Whiting, Rory Carroll, Alan Baldwin, Ken Ferris
Organizations:
Saudi, Prix, Jeddah Corniche, Driver, Grand Prix REUTERS, FIA, Reuters, Formula, Formula One, F1, supremo, Renault, Briton, F1 supremo, Liberty Media, Thomson
Locations:
Jeddah, Jeddah Corniche Circuit, Saudi Arabia, Paris, London, Singapore, Switzerland, Spanish