new tires vs new fe suspension

[Mercedes Fred]

had the front end of my 88 300e inspected, and the mechanic perscribed replacing all the rubber consumables such tierods ends, bushings, sway bar kits etc. for a reasonable amount ($800 canadian) but also said that new tires would be a better investment as its such a heavy car, should have excellent tires.

Sinc then i talked to a friend who works at dupont (chemist) who cliams that the quality of the rubber is very high in the mb; that in fact the rubber compnents in the front end were deteriorating by expanding, not crumbling and that this maintains a tight suspension that also increases the life of the rubber materials used

therefore, i should have matching rubber on the road. however, im tempted to do both suspension and new tires.