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Now when my car is a measure car I got the idea to investigate whether teflon in the engine oil can lead to less
fuel consumption? It was a long time since I changed the oil (it has gone over 6000 miles now), but before I do an oil and filter change - we have to do a
little experiment first. Since the last measurement of fuel consumption (Sample no. 16) only were a few days ago it was appropriate to make a test again to see if the teflon (that one can buy at auto parts store, etc) can be used in the engine of a car and if so - showing an improvement? One can compare it to a poor man's Slick 50, but instead to shell out several hundred dollars so maybe one can buy a spray with PTFE, emptying it in a pet bottle and pour it in the old engine oil? 
Said and done, I sprayed out almost a completely filled jar by directing the beam into a pet bottle (outdoor). The bottle was quite cold during the process but after a while spraying it became empty. I got 2 dl (3.4 oz) liquid teflon. Then I poured it in a cold engine. At first I drove the car with the new substance several miles - so it got thoroughly mixed with the engine oil before the actual test begins. Actually, I felt that the car rolled more easily after the addition but it can of course be a placebo effect? A subsequent check revealed that one could extract about 10 oz liquid from a full bottle of PTFE spray. As already said, it seems that the best method is to spray it in an empty 0.5 gallons pet bottle. I have also found that teflon liquid easily can be mixed with engine oil. I also did a thermal test and thus warmed up the teflon fluid to 400 degrees (Fahrenheit) but no deterioration was observed. It is in the beginning a bit cloudy but when the butane/propane has steamed away becomes the liquid quite clear and it happens at about 200 degrees. The teflon itself begins to boil for around 350 degrees. In early 2012, I received from unexpected directions information about what teflon liquid really is. Teflon spray or PTFE contains a white powder which is the actual Teflon. The liquid/fluid is in the other hand: highly refined mineral oil. If the powder is sufficiently small should it pass a oil filter and this is the case here because the teflon bullets readily passes an ordinary oil filter! The teflon effect contra the way to dose (in a hot or cold engine) is up to each individual to decide.
The test shows that the fuel consumption decreased. The point of dispensing teflon in the engine oil is that metal surfaces are coated with teflon. This ensures that the surfaces are kept apart even when the engine not can deliver oil (immediately after starting a cold engine). Some claim that teflon gather around the top piston ring, which impairs lubrication at a critical point - this scenario is related to Slick 50. Unlike Slick 50 is teflon spray dispensed less than Slick 50 and the risk of resulting cylinder wear should be decrease? What I have seen is that it is unnecessary to add teflon to a fresh engine oil to reduce friction, but it may be advantageous from
the point of wear - so my recommendation is:
1. Add nothing, or as most 2 oz teflon/PTFE in new oil - which you have just changed. 2. Never add more than 10 oz teflon (totally) - this for a car that can accommodate 1.2 gallons of engine oil. 3. Add 4 oz teflon, halfway through the oil's lifetime and one 4 oz to, just before the oil should be changed.
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