Echols & Shadily defined "gurih" as:
1. Deliciously oily (and salty) but causing thirst (of fried fish etc)
2. Delicious in general
'ke - an' = too salty and crisp

taking the context into account, you can safely add adjectives describing the taste of milk, such as rich, creamy, satisfying etc.

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Note added at 2003-02-01 16:56:25 (GMT)
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is \"gurih susunya lebih terasa\" part of an advertisement? It could be translated as \"the rich creamy taste of the milk is better tasted\" or a similar wording.

Hope this helps.