Thick is exactly what you want in the WBX.  Use 20w-50 in the temp range
it's recommended for, and if you live where the temps are regularly
below zero in the winter you could run 10w-40 in the winter.  The two
brands of orange long life coolant are Havoline Dexcool (black jug) and
Prestone Extended Life (silver jug) All FLAPS and chain stores carry it
now, and K-Mart and Wal-Mart are the cheapest @ $6 to $7 a jug.  You
need three gallons, and you also need to completely drain and flush the
old stuff out or it will poison the new, making it short life, just like
the old stuff.
--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Driven since 1969)
'74 MGB GT (Restoring)

Assisting on Restoration:
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Parts cars:
'68 & '73 MGB, '67 MGB GT