Every year I have trouble passing emissions in the '77 F250. Archoil claims both their fuel additive and friction modifier reduce emissions. Last year, I leaned the carb slightly and used 2 bottles of Iso-Heet to finally pass(barely by 1ppm on idle HC). After the test, I tuned the carb back since it runs better that way. This year, the only thing I did was put AR9100 in the oil and had been using AR6200 for a few weeks prior to testing. On to the numbers.
Last year 1st test(no additives fuel or oil):
Idle HC: 589ppm
Loaded HC: 186ppm
Idle CO: 0.21%
Loaded CO: 4.37%
This year(Archoil in oil and gas):
Idle HC: 318ppm
Loaded HC: 166ppm
Idle CO: 3.94
Loaded CO: 4.21
So, compared with last year, Idle HC was significantly reduced. Slight reduction in loaded HC and loaded CO. Idle CO quite a bit higher with the Archoil. Unfortunately, although some numbers improved, the truck still failed the loaded CO(limit 3.0%).
I went back to the good old trick of using 2 bottles of Iso-Heet with 6 gallons of 91 octane and 2.5oz of MMO(and possibly a small of amount of residual AR6200). The truck passed easily.
With Iso-Heet:
Idle HC: 244ppm
Loaded HC: 126ppm
Idle CO: 2.84
Loaded CO: 0.44
I know the best way to prove if the Archoil lowered emissions would be some sort of back to back testing, but this is what I have. Take it for what you will. I can tell you this though, If you're relatively close on the emissions test use Iso-Heet. It worked for Ol' Yeller anyways
Last year 1st test(no additives fuel or oil):
Idle HC: 589ppm
Loaded HC: 186ppm
Idle CO: 0.21%
Loaded CO: 4.37%
This year(Archoil in oil and gas):
Idle HC: 318ppm
Loaded HC: 166ppm
Idle CO: 3.94
Loaded CO: 4.21
So, compared with last year, Idle HC was significantly reduced. Slight reduction in loaded HC and loaded CO. Idle CO quite a bit higher with the Archoil. Unfortunately, although some numbers improved, the truck still failed the loaded CO(limit 3.0%).
I went back to the good old trick of using 2 bottles of Iso-Heet with 6 gallons of 91 octane and 2.5oz of MMO(and possibly a small of amount of residual AR6200). The truck passed easily.
With Iso-Heet:
Idle HC: 244ppm
Loaded HC: 126ppm
Idle CO: 2.84
Loaded CO: 0.44
I know the best way to prove if the Archoil lowered emissions would be some sort of back to back testing, but this is what I have. Take it for what you will. I can tell you this though, If you're relatively close on the emissions test use Iso-Heet. It worked for Ol' Yeller anyways