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Re: engine oil


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Posted by Janicholson on November 19, 2008 at 16:54:27 from (66.173.50.78):

In Reply to: engine oil posted by Josh Watson on November 19, 2008 at 16:36:34:

There will be many posts to follow, but My experienced opinion is to use 10-40 oil that you would use in a car. Good quality name brand oil is best. Others will say use single wt oil like 30.
or Non-detergent oil. Do not. The oils of today are great, and are making engines run for far longer than any oil of yesterday. If you do not know the history of oilin the engine, after changing the oil & filter, run it for an hour to temp, and look at a sample. if it is very black, I would change it, and filter again. Then change them after it shows very black again. THis might seem extreme, but that will help clean out residual trash and deposits. If it stays pretty clean, leave it in. Change it yearly if it is light use, more often if not allowed to warm up in use, and you should be fine.
There are viscosity index modifiers in multi wt oils that can be unstable if extremely overheated. (as in the engine was at 350 degrees till it seized) Your engine will never see those temps, so the issue is moot. The lower number is a cold condition thinness number allowing the oil to get to and lubricate things when cold, as well as to allow the engine to rotate and start when cold.
The upper number is the viscosity number when the engine is at temp, and it indicates that the oil never gets thinner than a 40 (in this case) wt oil would get when at temp. This thicker oil cushions and protects better than a thinner oil, and maintains better oil control in the cylinders.
There are specific numbers that go along with this data, and are available on line from many sources. JimN


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