Last year I put some Hot Shot Secret in my oil to take care of a couple of injectors in my F250 6.0L Powerstroke that had developed "stiction" problems. HSS is all the rave among the 6.0L crowd to resolve this problem. I *thought* it worked because over the course of a month or so the cold start up problems went away, it idled better before complete warmup, etc.
Well, winter came again and the problems showed up again, so it was apparent HHS didn't do anything, but instead warmer weather helped. Once the vehicle has been running about 15-20 minutes its fine, the stiction happens only when cold. It's been happening even now, in the spring/summer, but I've lived with it by letting the truck idle for 10-15 minutes the first start of a day.
I finally got to the point where I decided I was tired of waiting in the mornings, and I also know this coming winter its going to be a [censored] to start if I don't take care of the injectors. I decided I would get the sticking injectors changed at my next OCI (about 2500 miles from now). I decided what the heck, I'll try some MMO in the crank case to see if that'll take care of it (stiction is caused by oil caking in the injectors, they are fired by oil pressure). I had nothing to lose since I planned to change the injectors, other than $5 for a can of MMO.
Put MMO in the crankcase and drove about 50 miles that day. The next morning it *seemed* to start easier and idle better but I wanted to give it some time to rule out the placebo effect. Well, sure enough, over the course of a week and a 1000 mile road trip the startup is significantly better. The stiction goes away in about 30-60 seconds (ie, all cylinders firing fully) and its fully ready to drive off in about 3-4 minutes.
So my plan is to add MMO again at my next oil change and run it for a full OCI. If the problem is near 100% solved with that I'll pay for injector replacement but so far so good.
I've used MMO in the past in sludged engines, even used it on an engine with stuck rings (hadn't been started in years) and it worked so I gave it a shot in the 6.0L and I'm impressed.
Well, winter came again and the problems showed up again, so it was apparent HHS didn't do anything, but instead warmer weather helped. Once the vehicle has been running about 15-20 minutes its fine, the stiction happens only when cold. It's been happening even now, in the spring/summer, but I've lived with it by letting the truck idle for 10-15 minutes the first start of a day.
I finally got to the point where I decided I was tired of waiting in the mornings, and I also know this coming winter its going to be a [censored] to start if I don't take care of the injectors. I decided I would get the sticking injectors changed at my next OCI (about 2500 miles from now). I decided what the heck, I'll try some MMO in the crank case to see if that'll take care of it (stiction is caused by oil caking in the injectors, they are fired by oil pressure). I had nothing to lose since I planned to change the injectors, other than $5 for a can of MMO.
Put MMO in the crankcase and drove about 50 miles that day. The next morning it *seemed* to start easier and idle better but I wanted to give it some time to rule out the placebo effect. Well, sure enough, over the course of a week and a 1000 mile road trip the startup is significantly better. The stiction goes away in about 30-60 seconds (ie, all cylinders firing fully) and its fully ready to drive off in about 3-4 minutes.
So my plan is to add MMO again at my next oil change and run it for a full OCI. If the problem is near 100% solved with that I'll pay for injector replacement but so far so good.
I've used MMO in the past in sludged engines, even used it on an engine with stuck rings (hadn't been started in years) and it worked so I gave it a shot in the 6.0L and I'm impressed.
