Heat soak is when heat from a freshly parked up engine damages vehicle components over time - like years. We own the older cars. Can't stop it, just remember and allow for it. Not a problem in snow country.
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i