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Tractor Talk Discussion Forum

engine oil question

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in sticks

04-01-2006 17:11:36




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if i understand this ? detergent oil keeps crud in suspension in oil so's the filter can clean oil ?
non detergent oil lets crud fall to bottom of oil pan,therfore use non detergent on engines without oil filters?




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RAB

04-01-2006 22:37:50




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 Re: engine oil question in reply to in sticks, 04-01-2006 17:11:36  
Not quite. Only keeps relatively harmless carbon particles in suspension. You still need a filtration system. Detergent oils keep engine clean due to non build up of varnishes and other products of combustion or degradation of oil. Piston rings do not gum up and stick in the pistons with detergent oils.
On a perfect engine you do not need an oil filter, but that never happens(?), or would you take the chance of a nasty lump of very hard material (metal) continually circulating until it runs out one or all bearings.
Filters do not remove all oil contaminant particles. Some are better than others, but most will only trap down to a few microns (or filter would clog vey quickly and oil circulation would reduce or perhaps bypass the filter).
The best option is a full-flow to remove danger size particles and a bypass filter (a few % of total oil flow above a minimum pressure limit) to remove sub-micron particles.
BTW for the non Greeks, a micron is a millionth of a metre, or a thousandth of a millimetre. There are 25.4 millimetrs in a US inch (we only use inches for bulding models of old steam engines etc now).
Regards, RAB
I am awaiting any comments that the Greeks did not use the metre as a measurement of length!

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noncompos

04-01-2006 19:30:41




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 Re: engine oil question in reply to in sticks, 04-01-2006 17:11:36  
Also be careful if putting detergent oil in engine long run on non-detergent; loss of "dirt seal",and loosening of sludge, if engine has lots of sludge, has been known to stop up oil passages, etc., with fatal results...flush well when changing, watch oil carefully, don"t be bashful about changing filter and/or draining/refilling if oil looks too dirty; two-three quick oil and/or filter changes cheaper than rebuilding engine...

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RN

04-01-2006 17:59:05




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 Re: engine oil question in reply to in sticks, 04-01-2006 17:11:36  
About right, but early detergent oils had a rep for foaming and not recommended for splash lube systems, with or without filters. Current detergent multi-vis oils usable in most early systems for general use, concern is loss of 'dirt seal'. Current non-detergent straight weights oils have been improved and are still usable in many systems- engine, gear, hydraulic that originally recomended them. Brother uses 20 weight in JD60, B yet, annual oil change.

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