Originally Posted By: ahoier
From what I've read, people are typically running the KREEN 3000 mile intervals.....
BUT, there is a caveat....you're gonna wanna keep at least a quart of oil in your trunk....over time some of the kreen, and possible "residual" oil around the pison rings, will seep past the rings, causing some oil to "burn off" - this is typical of most any "engine detergent" I've used.
Seafoam did about the same in my Kia(s)...
MMO did the same thing in my 88 Aries...after about 1000-1500 miles into the OCI, I stopped for gas, figured I'd check the oil level, sure enough, the level was about half way down the stick. Some of the MMO had "burned off"....
Have heard similar testimonials with the KREEN - the SOLVENTS with their high flash point, typically burn off after a couple hours of driving time, but some of the byproduct is "left behind" to help with the cleaning, and "suspend" the gunk within the fresh motor oil you've added with the Kreen/MMO/Seafoam...
It used to be everyone was "up in arms" about running solvents in the crankcase more than 15 minutes....but the reality is, most of those solvents have such low flash point, they burn up within the first couple runs of the vehicle.....I recall my dad telling me how he used Berryman's B-12 CHEMTOOL as a crankcase flush.....but then a couple years back they totally removed the directions from the cans....likely due to "mis use" and complaints of damage done...in small increments solvents are a good cleaner. That is the key.
Last I read, it was typically 3 oz. of KREEN per quart of Oil...but you definitely don't want to keep topping off with KREEN!
What I do, when I use the MMO in my engine, I carry a bottle of 15W-40 (during the summer....) or 10W-30 (during the winter) and use that as top off.
Just remember though, don't go over 3000 miles with the KREEN/MMO/Seafoam in the crankcase...
Even though the solvents have "burned off" you want to let the suspended gunk/sludge/carbon expel through the drain plug, not get re-coked and dispersed around the engine galleys.
+1
Seafoam ~100 miles before OC to make oil black, "dont leave it in" it will clean some. You dont even have to, but hey, it helps clean.
The 100 mile advice is true because of the last statement, it makes the sludge more liquid and moves it around, and it does re-bake. Still, it helps, IF its going out in 100 miles or so.
Slow cleaning is what you want otherwise you are asking for trouble. Seafoam 100 miles before OC is safe. Half a can, or whole can. Only pour it in the oil if you know you are changing the oil and filter soon. As in.. 100 miles.