Is 5-30 a good weight for a 28 year old car with 117K?
It would seem an OK winter weight on the car new, but I would expect there would be a lot of seal drying and ring/valve stem seal wear that would drive one to consider a bit more viscous oil ...
Agree that 15-50 would be a good alternative - and, it still retain significant cold weather starting attributes ... ie does not thicken as much at low temps like dino oils do.
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg