Re: Dave, how long have you been doing the Lucas like this? - Saab 9-5 Bulletin Board - Saabnet.com
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(LONG) for a condensed answer, go immediately to the second paragraph.
Interesting hypothesis. I started experimenting with Lucas UCL about 2005 and within a year was using it religiously. By 2010 I was a full believer (as well as a Belieber) after using it on multiple Saabs, a Ford Taurus, a Jaguar XJ6, and more recently Jeep Wrangler and Ford Escape Hybrid. My main objective was to push fuel efficiency to the outer limits of a cheapskates capability so I have always been a hypermiler (in a milder sense) to squeeze every km out of every drop of ancient rotten liquified plant matter. Other observed benefits are improved power, smoothness and quietness observed both outside the car with hood open and inside through my highly developed foot sole nervous system. Especially important on the small displacement fours I have typically driven during the 1,000,000 or so lifetime km I have racked up. Typical fuel efficiency improvements are probably in the 2-5% range. I buy in bulk by using the 3.78l containers when on sale since the small tubular container yields a negative cost/benefit. The quantitative and qualitative improvements more than compensates me for the cost and effort in doing so. The only downside that I have run into is that overtreatment can lead to a drop in fuel efficiency as some cars may register a lean condition through their 02 sensors and automatically add positive fuel trim, e.g. a 1996 Jaguar XJ6. To KISS keep it simple system, I use a 50% dose ever other fill up or so but I admit my process is more art than science to eliminate tracking effort. The venerable Jaguar receives a more conservative approach. An added observed alleged benefit is that it eliminates sticking fuel level sensors (common on the Jag of that vintage) and seems to enhance the lifespan of automotive fuel pumps IMHO. Apparently lubricates fuel injectors too. Lucas UCL, according to my own primitive speculative research my contain PIB, polyisobutylene, that is used to make chewing gum among other applications. PIB apparently makes the fuel droplets more uniform in size and helps prevent pre-ignition as well as latent combustion that continues into your exhaust manifold. Thusly, it helps maximize the conversion of fuel into downward force on the piston (if only by 2 to 5+ percent). It's apparently also used in Jet fuel. I once sent a note to global association that is involved with the petroleum industry to encourage them to add it to all automotive fuels to reduce global gasoline consumption, increase component longevity and improve emissions but never heard back.
I have been using Lucas UCL since about 2005.
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