I think bladder sludge, which is caused by too much calcium or salts in the urine, can cause thicker than normal urine? None of my rabbits have ever had bladder sludge before though so I can't tell you for sure.
The color of rabbit urine is diffrent from humans, it can appear to be orange or redish sometimes depending on what the rabbit eats and how long the urine sits in the cage. However, I don't think it's normal to be syrupy.
I would definatly start by getting him on a diffrent food that's made for rabbits.
Remember that pet store owners have no where near the same training as vets do, and cannot always accuratly diagnose your pet. It's great that you have someone to get advice from, but they shouldn't replace a rabbit savy vet. Rabbits often hide their symptoms when they are not feeling well because they're a prey species, and sometimes if you wait untill they are feeling really aweful it can be too late.
Good luck with Turbo. And please do post some pictures of him, I'd love to see him!
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