Quote:
Originally Posted by t walgamuth
I don't get where you find any factual basis on claiming the bearings are "dry". The only way you could get there is to disassemble the engine and clean all the bearing surfaces of all lubrication, then reassemble.
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After 20 years, it may not be chemically dry, but the lubricity of what is left should be considered severely compromised, akin to cold starting an engine after a couple of days. This is my understanding of why the oil recommendation is getting a smaller lower sae number, such as 5w30 getting away from 10w30. The initial start up is the critical factor in any engine designed last year or 50 years ago.
Oil TSM from the ancient times aka the early 70's, recommend to drown the engine in oil if extended storage over 6 month is expected: fill the oil pan as much as you can, and dump oil to intake till overflow... repeat for cylinders... can you imagine the labor intensive restart procedure?
I had an engine waiting on an engine stand for over a month, and yes there is always an oil dripping stain, but in this case the history is different.
I have no issues with an engine being cranked every other year which has fresh oil, and being driven at operating temp for 15min.
Yes the oil topic will always bring many lines of discussions and interpretations.