Porsche 924 (ok, so it had a vw engine)
BMW 528i E28 (early 80's shark nose one)
Pug 205gti (was my mums actually, she had some cool cars too)
BMW 535i E34
BMW 540i E34
BMW M5 E39
caterham 7
he had a couple of pretty uncool cars too though, including a mid 80s Jag xj6, late 80s merc E class, a Volvo 240 estate at some point (though would be cool now for mtbing!), a beige Audi 80, a BMW 7 series (way too big) and an s class merc (again way too big)…
Edit: CFH's grandad sounds WAY cool! My grandad was sadly only into ridiculously huge cars that barely moved (mid 70s rollers and bentleys), rusted a lot and looked stupid…