Anyone remember ARCO Graphite Oil? Supposedley, they found a method of suspending the graphite in the oil without settling. I used it in a couple vehicles and it worked fine; havn't seen it in years. Only problem was it went in BLACK!
when I used to do valve jobs at a machine shop when I was 18 , we used to coat the valve stems in a mixture of Arco Graphite and stp 50/50 before we installed them ...was told it help seat the guides very quickly as oppsed to just regular motor oil.
I remember Arco graphite. I remember getting better gas mileage with it than other oils, but I understand that there was a problem with the oil and it was discontinued. I don't know what the problem was but I see that no one has since made a graphite oil.
I too used the stuff in my 77 Vega-gt. I used to buy several cases at a time, because I couldn't buy it locally. I remember that it was very thin and worked well in our cold winter. I later switched to synthetics (easier to obtain were I live). BTW to this day that was the most reliable car I have ever owned!
[ September 11, 2002, 04:23 AM: Message edited by: Ross ]
Correct my reasoning on this, but didn't ARCO quit the oil, not so much as the black color right off the bat, but using it in engines with "crud" so to speak in them, caused the materials to break loose and clog passages?
I used it in my '84 VW Jetta. When I got it in '89 with over 90K miles on it...the previous owner told me that he'd tried Mobil 1 and the car ran better and had cooler oil temps with the ARCO Graphite.
I had the valves adjusted shortly before I traded it in. The mechanic was impressed with how good the engine internals looked. I don't believe he mentioned the word "clean" since I imagine it was pretty black from using graphite oil for all those years. That car was still running strong when I traded it in with 194K over 5 years later.
I'm willing to bet that the combination of poorly maintained fuel system (carburetor choke in particular), leaded gas and blowby caused enough spark plug fouling to make it unpopular besodes appearance.
I first recall a neighbor using it in his OLDS V8-350 diesel.
The old man used SHELL 10W-50 in his '74 & '76 Cadillacs from the mid-70's until it was no longer available (early '80's?) and those motors ran a very long time.