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Original Message
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| RE: oil for old engines |
| By gerry - 08/09/2000 7:19:17 AM; IP 208.217.67.189 |
First, the weight oil you use largly depends on how tight the engine clearances are. If the engine is fresh and bearings are running less than .002, then you can probably use a 10W-30. If you are at or over .002, then you would want to consider the heavier weights. But the real criteria is what your hot/cold and idle/2krpm pressure is.
The proper oil also depends on how you use the engine. If you operate the engine in very hot climates or run it hard, you would probably want to consider a heavier weight oil.
Synthetics are not a problem in older engines, but be aware that synthetics have a way of finding their way out of your engine through previously tight seals. You would have to try it to see if your engine becomes a leaker. Otherwise, there are no mechanical drawbacks.
Older, worn engines as a rule tend to favor a heavier weight oil since their bearing clearances have opened up through wear over time. Oil does not penetrate bearings. It forms a film between the journals and the shell. When the oil is too thin, it shears and allows contact. You most of all want to maintain that film strength and you do that by selecting an oil that has a high enough viscosity. |
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