"Techron" Techron is a patented additive developed by Chevron, consisting of a family of compounds known as polyether aminess. Techron reduces accumulation of deposits in fuel injectors and on intake valves, and minimizes build-up of deposits in the combustion chamber. With the introduction of Techron, Chevron gasoline became designated as meeting TOP TIER standards for fuel cleanliness. Techron is also available as a packaged concentrate, for use with lower quality gasoline ("under-additized"). Both Volvo and Mercedes-Benz have issued factory service bulletins advising the use of concentrated Chevron Techron in repair procedures for vehicles with certain mechanical problems. Of course, reading many posts of Rennlist '928 Forum: http://forums.rennlist.com/ many owners had positive chat-posts and experiences, helping them with rough idles, and at times with no starts. My personal experience was I believe the additive stopped my 928 from 'shaking,' while at low speed, and low rpm's. When I initially emptied the entire bottle in the tank, and started it up for the first time; a dark cloud of 'brown colored' smoke came out of the tailpipe, and I believe I flushed out allot of old carbon. I then drove at high RPM's for 180+ miles, at high speeds. I refilled twice, once at Chevron, and another at Shell. I could only imagine the old grime, which could be in the fuel injection system and tank from a thirty-two year old car. I really thought I would be traveling with brown smoke for awhile; however, only noticed it on the initial start up. Maybe the traffic behind me witnessed more? LOL. I was hesitant at first as my 1978 Owners Manual states on page 51 in bold letters:
Porsche recommends not to use any fuel additives. Oh well, like I listen anyway most of time. However during my rennlist experiences, and as an Internet 928 mechanic. Sometimes I read another owners post, and try to prevent or clean, or whatever. I have come to the conclusion every 928 is different, and each one has their own individual temperamental issues. What is good for one 928 is not good for all......
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