looking to buy a 1994 XJS Coupe 4.0 Liter 6 cylinder

so going to check out a 1994 Jag XJS coupe 4.0 in the next day or so. has about 90k miles. What should I be on the lookout for, besides everything, LOL --NOt new to British Cars but new to the Jags --Was told not very expensive to maintain it, is this true? What are areas of concerns on these cars. I know the engines and Transmissions are very Robust

BTW

Any advice would be great

thanks

Paul