Pronunciation

It doesn't seem to be a regional thing, but more of where you learned it from.

Oblique. Ob-leak or ob-like?

I say ob-leak because we use technique, not tech-nike.

Detent. Dee-tent or day-taunt (detente)?

Dee-tent because it's an English word which means a catch in a machine that prevents motion until released. Day-taunt is a French word meaning the easing of hostility or strained relations.