TCW3 vs. XD-100 E-Tec oil in older outboards

[Smokin' Joe]

It works fine. One of the cleaner burning oils out there. My 1961 six horse Merc has consumed 12-14 gallons of mix at a dead crawl idle for hours on end getting tuned in for fishing this summer. I have a drum of it I could'nt give away because of the price so I have started to use it up myself.

I now know from personal experience XD-100 burns very clean and lubricates very well. I caught a plastic bag over my 1983 Johnson 35 gearcase/water intake last fall, fried the waterpump and so had to tear the motor down for reboring. After 8 hrs. with XD-100 @ 37:1, no carbon anywhere and good looking bearing surfaces. The motor knew two speeds, idle and wide open (6200 RPM). So I'm using only XD-100 in all my classic full-jeweled motors @ 50:1 in the future. We're putting together a 1975 Johnson 75 powerhead with 1979 cowl, downhousing, will see how that goes. That motor will turn 6500-6800, always used TC-W oil @ 25:1 when racing in the olden golden days of outboarding.

[Smokin' Joe]

It works fine. One of the cleaner burning oils out there. My 1961 six horse Merc has consumed 12-14 gallons of mix at a dead crawl idle for hours on end getting tuned in for fishing this summer. I have a drum of it I could'nt give away because of the price so I have started to use it up myself.

I've now run it in a good 1981 Evinrude 15 50:1 @ 6500 RPM, and in our ca. 1980-1990 JohnRude 35s, 6200 RPM @ 37:1. Burns very clean and lubricates bearings well. Tore down one 35, no deposits on piston crowns. So sounds like you're right!