Oselli started out in 1962 and was originally called Oxford Engine Services.
As an engineering company it originally specialised in the tuning and performance of BMC cars and is one of the survivors from the tuning boom that is still alive today.

Their first products were for the Mini initially porting and flowing of cylinder heads, fitting large valve heads and then increasing engine capacity. As they soon became quite well known for high quality products they expanded their range to include items for Austin, Austin Healey, MG, Morris,Triumph, and Oxford Engine Services had become well established in the tuning world.
In the 70's their products were in such demand they expanded to include Ford & Vauxhall products and with their products being used in motor sport the company name changed to Oselli as it was considered to have a better more Italian ring to it.
Nowaday's they still produce items for the 'A' & 'B' series engines and also Aston Martin.