In Praise Of Wynn's Clean Burn

[kora]

My 1995 petrol 4.1 RAV4 failed it's Irish (Republic) NCT emissions test on its High Idle Lambda reading of 0.968 (fail if not between 0.997 and 1.03) and a High Idle CO reading of 1.18% (fail above 0.3%). I resat the test some time later after adding two bottles of Wynn's Clean Burn to a tank of petrol and driving at high revs, and passed with readings of 1.006 (Lambda) and 0.17% CO. I'd seen RAVs in better shape than mine being scrapped after failing the emissions test so I was !Removed! relieved and grateful. Two years later I've followed the same procedure and passed first time with improved readings. It's definitely worth a try for these older models.

[Davrav]

My 1995 petrol 4.1 RAV4 failed it's Irish (Republic) NCT emissions test on its High Idle Lambda reading of 0.968 (fail if not between 0.997 and 1.03) and a High Idle CO reading of 1.18% (fail above 0.3%). I resat the test some time later after adding two bottles of Wynn's Clean Burn to a tank of petrol and driving at high revs, and passed with readings of 1.006 (Lambda) and 0.17% CO. I'd seen RAVs in better shape than mine being scrapped after failing the emissions test so I was !Removed! relieved and grateful. Two years later I've followed the same procedure and passed first time with improved readings. It's definitely worth a try for these older models.

Not knocking the Wynns but could it just be the high revs clearing all the accumulated crud

[kora]

I'd given it an Italian tune up before the first test which hadn't helped much, although the oil temperature was 89 degrees (76 for the re-test).

[bothwell_buyer]

I only use Shell V Power in mine and haven't had a problem. It must make a difference.

[kora]

I didn't mean to promote Wynn's particularly, probably any of the kerosene based additives might have done the job. Saved me the cost of a new car (plus old one), that's why I'm so pleased with the stuff.