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Low Ash Oil?

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IaGary

06-10-2006 07:21:46




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I have a 560 that uses oil and doesn't smoke at all.

What are the reasons for low ash oil and will the low ash help the oil problem?

Just wondering. Gary




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billde

06-11-2006 04:55:08




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
At what percentage is oil considered low ash? There are a lot of oils advertised as low ash oils on the market, but what is the cut off point.



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sammy the RED

06-10-2006 20:41:39




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
Pennzoil is a low ash oil.



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Janicholson

06-10-2006 16:38:20




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
Coking is the buildup of carbon and ash deposits that are heated to less than carbon combustion temperatures. On engines prone to coking, the valves (usually intake, but not always) have excessive oil comming down the guide, This excess oil, and valves that run hot from engine design and placement of coolant passages in the head, combne to build up the deposits that cause the back side of the valve head to be insulated from incoming air/fuel and as a result they over heat, warp, or just burn an edge (margin). I have seen so much carbon on the back of the valve that the engine could not breath and was making maybe 15 HP total.
The way to repair them in my "book" is to use better valves with a slightly thicker margin than original, (even if some research and grinding are needed. Then I would use Perfect Circle style valve seals on the stems (they use a teflon ring in a special rubber umbrella that actually meters the oil into the guide. This assembly leaves less to chance. I would then run 15-40 oil (diesel) because it is capable of maintaining good 40 wt viscosity at operating temperature, while remaining thin enough at ambient temperature for good starting till winter sets in. Diesel oil is usually a low ash oil (as are a bunch of regular gas engine oils marketed today) Synthetic oils, are essentially ash free, and will not coke till the engine is already toast from no coolant or some other disaster. These findings are from a mechanics experience and education spanning 40 years. JimN

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K.B.-826

06-10-2006 12:57:37




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
Andy's right on. Also, IH six-cylinder gas engines (C-221, 263, 291, 301) were designed to allow more oil down through the valve guides than many other engines. Using non low-ash oil WILL cause a burned valve.



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andy r

06-10-2006 08:57:29




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
Low ash oil will not help your oil consumption. Here is what I have gathered about low ash oil. When the scraper oil ring on the piston wipes the oil from the cylinder wall on the downward stroke it still leaves a film of oil on the cylinder wall. This oil will burn when the gas/air mixture is ignited. If it is not low ash oil it tends to leave an ash like residue left from combustion. This residue creates the deposites on the valves, spark plugs and tops of the pistons. Eventually these deposites can grow and make a valve not close properly causing a burnt valve. Other deposites can flake off and get under a valve causing a burnt valve. I have a 706 that has drank oil also without any smoke. The problem has always been weak scraper oil rings. The engine always had good power as the compression and oil rings sealed things up good enough. It was just that the scrapers were worn out. Last time it just got new rings and bearings. The time before it got sleeves, rings and bearings. When they drink oil you have to keep hot plugs in them to keep them firing. Eventually they get so bad you can't keep oil in the crankcase.

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Geoff NY

06-10-2006 08:52:32




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
"Bout 30 yrs ago I shared space with an oil wholesale distributer and if my old brain is functioning, I seem to remember low ash oils were usded for propane applications. This info may be dated as I tend to only use diesel oils now. Geoff



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PAULIH300

06-10-2006 07:30:38




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
I believe low ash oil is required for diesels as it leaves less deposits behind as the oil breaks down under the intense working heat of a diesel engine.It wouldnt change oil burning at all.You might add a bottle of Lucas oil treatment to see if it slows consumption down.



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Steven@AZ

06-10-2006 09:28:14




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 Re: Low Ash Oil? in reply to PAULIH300, 06-10-2006 07:30:38  
Low Ash oil is NOT for diesel engines.

It is for gas engines.



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PAULIH300

06-10-2006 15:55:56




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 Re: Low Ash Oil? in reply to Steven@AZ, 06-10-2006 09:28:14  
Well if it wasnt meant for diesels back then,it sure is now.
http://www.mema.org/publications/articledetail.php?articleId=3043



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Steven@AZ

06-10-2006 20:24:36




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 Re: Low Ash Oil? in reply to PAULIH300, 06-10-2006 15:55:56  
I stand corrected.

However, the Case/New Holland/IH low ash oil was originally made for gas engines only.

I see the article states that the new low ash oil is due to the emissions requirements and to work with the low sulfur diesel fuel as well.



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PAULIH300

06-10-2006 07:30:07




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
I believe low ash oil is required for diesels as it leaves less despoits behind as the oil breaks down under the intense working heat of a diesel engine.It wouldnt change oil burning at all.You might add a bottle of Lucas oil treatment to see if it slows consumption down.



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IaGary

06-10-2006 07:23:53




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 Re: Low Ash Oil? in reply to IaGary, 06-10-2006 07:21:46  
Its a gasser.

I forgot to mention that.



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