Quote:
Originally Posted by BigRandy
I used a bottle of MMO right before my oil change. Less than 100 miles. Did it twice with another very short OCI and then used only Rotella with continued, short OCI's of 1500 miles. After maybe the 5th oil change the innards started to look good again.
I'm not a fan of oil thinners but took a chance on MMO because it's been around since the dinosaurs and everyone loves the stuff, but I didn't leave it for the full duration of the oil change as suggested on the bottle. I kept it in just long enough for the oil to turn black. No harm done but of course YMMV.
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I build engines for a living, and I agree this is the key, anything you add to the crankcase needs to be there for long enough to clean it up and nothing more. Once the oil gets dark it’s time to get it replaced. A few months back we had a 3304 cat at work that blew a couple head gasket Orings. It filled the crank case with with coolant pretty bad. After the head gasket set and a fresh head because I was had it tore apart that far any way; I chanced the oil and filter and replaced about 1 gallon of oil for 1 gallon of diesel(it holds about 10 gallons of oil). Started the engine, closely monitored the oil psi and only ran the engine at idle for about 1/2 hour. Changed the oil and filter again (oil was not only milky but quite dark from the cleaning the diesel did) and filled completely with fresh oil. Same thing started it up again and let it run about 1/2 hour at idle. Drained the oil one more time just to check and see how much more coolant came out, leaving the filter this time, the oil was clean. Refilled again with fresh oil and it’s been running ever great ever since. Keep your engine speed down and don’t let it run for too long and you will be fine.