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Re: Synthetic Oil Change Interval
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Posted by Jon Hagen on February 11, 2007 at 14:44:13 from (75.104.56.247):
In Reply to: Re: Synthetic Oil Change Interval posted by John M on February 11, 2007 at 06:20:50:
My experience with a good POA based synthetic oil like Mobil 1 or Amsoil is that the ring seal is much superior to what is achived with mineral oil. This results in much less blow by garbage getting into the oil to dirty it, The oil does not get dirty nearly as fast, so you can often extend the oil change by 400% and still not have a damaging amount of contaminants in the oil. Because of this superior ring seal with synthetic oil, oil consumption is often 1/2 or less of what it would be with mineral oil. One experience with a little Nash 196 engine showed me how even a "hurt" engine can survive for a long time with a superior lubricant in it like Mobil 1.
The Nash 196 has a bad reputation of being an engine with so much crankshaft flex that it is very hard on main bearings. The one I was driving had so much main bearing rumble that it would scare you to rev it up while under the hood. The main journals were worn and really should have been ground to get the journals straight and round, problem was that no undersize bearings were avalible for this obsolete engine. I did manage to find a set of standard bearings to put on the worn crank. The worn crank immediatly started to destroy the new bearings and the main rumble started to return within a few hundred miles. As a bit of a desperate experment, I drained the mineral oil and replaced it with Mobil 1 synthetic oil. This quieted the bearing noise which did not return during the 30,000 miles I put on that old engine over the next dozen years before finally putting the car into storage. In severe operating conditions,like bearings running on a badly worn crank, the POA based synthetic oil really showed how superior a lubricant it is.
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