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smokydog 02-03-2006, 11:03 PM I have a friend who is using rubbing alcohol as an additive in his duramax. I told him this was a no no but he dosen't believe me. He is having a problem loosing prime also could this be related or not. What are all the problems this could cause. blnagel 02-04-2006, 10:10 AM Alcohol = water concentration! ShumDit 02-04-2006, 10:55 AM Specifically taboo by GM ~ its diminishes any lubrication quality of the fuel on the injectors. Bad, bad badk. I believe the dealers do sample test for alcohol ~ repair will be on his bank acct. jholly 02-04-2006, 11:42 AM Not to mention the drug store rubbing alcohol is not 100%. It is diluted with WATER. Why would anyone want to put water into the fuel tank? Jim modified 02-04-2006, 08:13 PM Maybe he's thinking about a gasser. I believe most gasoline freeze preventers are concentrated isopropyl alcohyl. As far as a diesel, as said above, alcohyl is a No No! Brennan monster 02-04-2006, 10:53 PM Modified hit on the head! deffinately not a diesel:agreed: elvis_knows 02-04-2006, 11:25 PM Ordinary gas-line antifreeze and water remover (e.g.: "HEET") is 99% pure methanol. But there is a new product, Iso-HEET, designed for use in all 2-cycle and 4-cycle gas and diesel engines, that contains 99% isopropanol and a special additive. But the highest concentration isopropanol rubbing alcohol is 90%. Ordinary rubbing alcohol is only 70%. There's already too much water in both of these. I'd avoid even the approved additives unless there's a definite need. NathanielD 02-05-2006, 10:23 AM yes, and the cheaper brand rubbing alcohol is 50% isopr. and 50% water. Very Bad...... | ||