Source: http://www.setonresourcecenter.com/msds/docs/wcd00043/wcd04377.htm 1,2-Dichlorobenzene" (CAS 95501) C6H4Cl2 Is it not the consensus or expert opinion of many here that Chlorinated Solvents should not be in an engine? For disclosure purposes I am not trying to smear MMO, as a past user myself. Furthermore, perhaps I overread it but the MSDS did not provide % composition of the solvent. Therefore it could very well be a insignificant or majority part of the mix ... I do not know. I have always been along the lines that it is not a harmful additive, it is just the possibility of benefits are controversial. The presence of Cl however is worthy of peer review here. Thanks!