DTC 35 Gone w/Lucas Semi-Syn 2-cyle oil
Can't really believe this happened yet. I've been living with that DTC 35 code problem for years now. Following advice, I added heavy doses (up to a gallon) of standard dino TCW-3 with no noticeable change in driveability. As described, the DTC 35 code would go on and off intermittently, killing the cruise control if it was engaged, especially around the 1750 rpm mark. Only reliable time for using cruise has been under heavy load like towing or against a strong headwind, but DTC 35 would still trip on almost any downgrade or deceleration. No other drive-ability issues whatsoever.
Went in to get my usual dino gallon of TCW-3 at the local farm/ranch store and saw this Lucas stuff on the shelf next to the dino. A full $10 per gallon more than the dino, but it was rated for chainsaws & motorcycles and I needed chainsaw oil anyway. Dumped a little over a quart into my half-tank full K3500 and started driving. Of course, got the code a couple times in the first 100 miles or so, but then it went out for good!
Now, after some 400 additional miles, long up and downgrades, cruise control on - still no code!!! And I have not yet added any additional Lucas over that first quart!!!! The label on the LUCAS promises everything, but didn't mention my 6.5 code problem! I'll let you all know if it quits working and the code comes back. $10 extra well-worth the cost!!!!