I use the diesel fuel catylist, but for other reasons.

The reason it affects older o-rings is a combination of the lack of elasticity of the old rubber, and the reduced seal-swell from the lower aeromatic content of ULSD.

It seems in theory that adding a solvent to the diesel fuel that will increase the seal swell would prevent the problem, such additives are often used in the production of biofuels and WVO products and I'm guessing that seal leakage is less common for those running bio and WVO for that reason.

__________________

Gone to the dark side

- Jeff