the use of diesel has a long term effect - not only does it make ur hands and everything else stink,but with dermatological and carcenagenic properties with the possibility of skin problems and possibley cancer are heightend, we were warned to stop useing it, which we did about 11 years ago, hse also argue that although the flash point is high there is still the risk of it allowing a fire to spead more quickly, also any chemicals that are used in the yard need to have a fit for purpose statement and a cosh report, so to cover ourselves we now use both cliplube and scaffease although personally i like cliplube better as a little cheeper and leaves a nice residue behind on the fittings- ope this helps