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GM THM R1 94 and up 318,325,328,525 and 528



It seems that fluid adding / checking dip stick in the  GM THM R1 has been
done away with.
I understand that it is being pumped into the side drain plug(when it has
been lost from a busted cooler line), the trans is then  warmed up to
40celsius and then filled until it can't take anymore. This is not just a
better idea, it's also a messy hassle .

Why? $5 Cost savings of a dip stick?

Is Dexron 3( isn't this the fluid used) so stable that it will last for the life
of the car(10-15 years)?

There must be a reasonable service life on a Transmission which has no
service maintenance. What is the service life in miles?
( Go ahead tell me 250k easy and I'll buy one.)


Regards,
henri baccouche