Heres what I found on using Rotella 15/40 oil in my hi mileage Ford F150 v8.351 ci.Changed the oil in early Dec.On start up I had a lot of noise and erratic oil pressure.Never had that before.I found info that said Rotella had a cold pour point like 30 wt oil..Now the owners manual says Rotella 15/40 is ok above 30 degrees.After several rappy starts I dumped the 15/40 and put in Chevron 10/30.Noise and erratic oil pressure gone.Had the same experience with a hi mileage Mercury.I cant see how the vertical oil filter could drain back.I suspect the oil pump drains back and has a hard time pulling cold oil thru the pump screen.On my Ford 640 the horizontal filter can drain back. The oil pump has to refill the filter can before you see oil pressure on the gauge. As for MMO it is loaded with solvent.I might put it in an old tractor that is pumping oil.Never in a modern engine because of the high solvent content.I looked up the the data sheet on Rislone.It says petroleum distillates.That could mean light oil,diesel,kerosene, mineral spirits.I note that some posters are so full of themselves they could never be wrong.I learned that I cant use 15/40 oil in my truck.
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