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There just isnt a miracle oil additive that will give increased mileage. Lower viscosity is the only way to decrease "drag" from fluids. Modern "Energy Conserving" motor oils already contain a friction modifier that helps the rings scrape the oil away a little eaisier, resulting in a theoretical 1.5-2 percent increase in gas mileage.
Molydisulfide is slightly corrosive extreme pressure lubricant and should probably only be used in gears, not engines. The moly that is used in engine oil does not contain sulphur. It is used as a substitute for zinc.
Redline gear oils claim an increase in mileage, but only for short trips. Once any oil gets up to operating temperature, the viscosity is identical and so is hydrodynamic drag.
Some people report that they are getting better mpg (sometimes significantly better) with synthetic oils, especially with Mobil1, Royal Purple, Amsoil, and Redline.
Personally, I currently running some SL Mobil1 I bought a while ago, and so far I don't see any statistically significant difference. While I can believe that synthetic may be a bit better, claims of 10% or better mpg due to a different oil are a bit hard to believe.
Maybe those who get significant increases in mileage have engines/operating conditions that never allow the engine oil to even approach that 210F temperature range that is considered "normal". Synthetics with larger viscosity index numbers (look at the viscosity at 40C spec.) are thinner at low-mid temperature, so have less hydrodynamic drag under those conditions.
An engine can have normal coolant temperature and still have cool oil, or the reverse, so dont use the dash temperature instrument to estimate oil temp. The BMW ran borderline overheated coolant most of the time, but the oil was at a nice safe temperature.
I have a 06' f-250 6.0l, I was getting 17 - 18 highway, and found a product called D-SOL that you add to your engine oil and I average 21mpg highway calculated.
My mpg computer shows 19.8
You can buy it off e-bay
Hehehe, they don't call it additive any more, it's a fortifier
In any case, I'm somewhat (?!) skeptic about such mpg claims, and at the very least, I'd like to see a virgin oil analysis on BITOG. Some of the common additives (i.e. Valvoline Synpower) has been analyzed and it's well known what's in them.
All I know is what it did for my truck, I do know that additives with, Molly, clorinated perifin, tefelon dont work for fuel millage, the d-sol uses none of them.
I am just letting people know what it did with my truck.
I did alot of reading on additives and found that clorinated perifin, and boric acids are very dangerious to your engine. if you get water in the engine, or the engine gets hot it can make the oil go into a acid state causing damage.
(just what I have read on the net)
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