When I bought my 91 vanagon, it had the green coolant
in it and the van had NO coolant leaking problems.
About 3 months ago I put in the (expensive) VW Orange
Coolant and I have had no end of coolant leaking out of
many hose clamps etc.  Even the heads are weeping
orange coolant and it is a new (50,000 kms) engine.

My (trusted) mechanic says that orange coolant has
"smaller molecules", or some such, and that if I go back
to green coolant the heads will not weep and I will have
fewer other coolant problems.

Do any of you guys have any input on this?  Malcolm
Stebbins