[mwebb]

the coolant that circulates near the EGR may be used to
heat the intake manifold
as with many of the engines that have oil coolers with coolant circulating in them .
the coolant serves two purposes
to cool a hot system
and
to heat a cold system

because the system pollutes less when it gets to operating temp sooner .

_____________
oil
the dogshnit oil that many people think is ok to use
has low quality additives which cook out of the oil then tend to deposit out in the system in places that cause damage to the system
piston ring lands
EGR plumbing
PCV plumbing
the backs of intake valves on DI systems
and
last
but
not
least
Catalytic Converters

that s right , there i said it ,
AGAIN
dogshnit oil kills cat converters and engines

so
stop using dogshnit oil

start using oils that meet
BOTH
the viscosity specification for your system
and
oils that have
ACEA A3 B3 , A3 B4 specification .

when you do
you will find less ASH deposits in your EGR .

until you do
nothing will change