We may have to investigate additives soon, because our friends at the EPA have now revised even the Diesel rated oil specs for 2007, to reduce the ZDDP in that oil too! My problem with over the counter oil additives is that there is no reliable information as to what is actually in them, and what good if any it actually does to an engine. Some contain ingredients that have turned out to actually do damage to engines ("Slick 50" and other Teflon containing products come to mind). Engines are so tolerant of what is in the crankcase that many engines soldier on for years with all sorts of ersatz contamination and never have a symptom, so anecdotal evidence is totally useless. I see it as a continuation of the old snake oil business - some additives are simply solvents, and some are simply viscosity boosters, some have alcohol to swell seals etc., and all make outrageous claims, backed up only with anecdotal evidence - sure proof of quackery, in my opinion. This is right up there with food supplements, diet plans, vitamins, the Chia-pet and all the other things you see advertised on TV - I don't trust ANY of them! I'm sure a competent oil researcher could come up with an anti-wear additive that would bring modern oil back to the level of protection that our cars were designed for - but I don't know of any one who has done that, and put it on the market. There is a company called DCM industries, that markets "Motor Head" oil for antique and classic cars, which contains enough ZDDP for us, but I'm sure it is quite expensive - my guess is that they simply buy a major brand oil, add some anti-wear additive, and re-package it for sale to us collectors. I have no information about it at all, that's just a guess. Their e-mail address is crosmobile-sk@xxxxxxxxx Dick Benjamin -----Original Message----- From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of DR CHALLENGER Sent: Wednesday, September 06, 2006 5:49 AM To: mailing-list@xxxxxxxxxxxxxxxx Subject: RE: IML: How about Synthetic oils? (Ken Lang's question) what about adding an additive? >From: "Dick Benjamin" <dickb@xxxxxxxxx> >>I'll try to answer this - if it goes through, maybe things are working >again. > >Yes, unless the synthetic oil is recommended for use in Diesels, I doubt >very much that it contains enough ZDDP for use in car which is seldom >driven. The reason for that is that in order to qualify for an SL or SM >rating (look on your oil container), the Zinc Anti-wear additive has been >eliminate to avoid poisoning the catalytic converter in modern cars. In >other words, if it is sold for use in modern cars, it isn't the right stuff >for a collector car that is parked for weeks at a time. When Mobil One >first came out, this wasn't so serious a problem, but the SL and SM rated >oils have really dropped the amount of ZDDP to just about zero - the SK >article gives precise numbers, which I don't have at the tips of my fingers >at the moment. > >Dick Benjamin > ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm