Beware that the citric acid treatment will kill the silica pack in your coolant tank, so you either need to swap in an old tank for the treatment, or be ready with a new tank after the treatment.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC