Welcome to Bayside Diesel Service and Supply Online.

We are located on the Mystic River in Historic Mystic, Connecticut on a location serving commercial and leisure mariners for over 50 years.

The founders of Bayside Diesel Service belong to an extended local family who have been serving local, transient, and nationwide clients for over 50 years, providing full-scale marine products and services.

Bayside has concentrated on diesel engines sales, service, repowering and custom exhaust systems for the past 20 years. Their client list is as extensive as their experience. Whether you need a basic filter change or a full repowering, Bayside is the place to go for top-notch service.