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Federico, thanks so much for the reply.  I guess it's good to know that having the colon in our title tags all this time hasn't necessarily hurt us.

Does Google view the colon as a keyword separator like it does with the pipe (|) character?

Currently, our site automatically constructs the title tag based on the page name given by the user.  Long ago, we started using the colon character to visually separate the brand & model of the product from the size, and as a result, all of our title tags have been constructed this way. This was done more to make it easier to read for humans than for search engines.  My question is - should I consider getting rid of the colon from our title tags?

To give more info, our website sells tires. So, for any given model of tire, there might be 25-100 different individual sizes.  The tags are constructed as follows:  (brand)(model) : (size).   Here's an example from our site:

GENERAL ALTIMAX ARCTIC : 225/45R17 91Q

The brand is General Tire, the model is the Altimax Arctic and the size is 225/45R17 91Q

Since this entire string really constitutes the full product name, should I remove the colon so that Google views it that way?  Or, since I have used a colon instead of a pipe, will Google simply ignore it and treat the entire string as one keyword phrase?