Thread: WA CS bar oil

Geeese $50 for 20 litres!!! holy moses that would be a bloody good price - pity freight would kill me hahaha

freight from WA isnt that bad Alan as most of it is back load

I old millwright told me they had the best success using used diesel engine oil. He says the large amount of suspended carbon makes a good bearing surface for that metal on metal interface.

Don't know, but since Lucas recommended "any" oil for the slabber I have been using it there.

Caltex chain and bar $64 for 20L

Originally Posted by CJR72

Caltex chain and bar $64 for 20L

The best I can get Caltex B&C oil for in WA is $90 for 20 L

205lt Tru blu bar and chain 512 inc gst

Originally Posted by Krunchie

205lt Tru blu bar and chain 512 inc gst

Thats ~$2.50 /L which is the same as what the bloke from WA is quoting.

He's also a tru blu agent - could all be the same stuff.

maybe he make a shandy with a lower priced oil to increase his margin

thats pretty cheap.

CJR72 - where did you get that price from?

we just use the cheapest engine oil available for our saws.

i would never use used deisel oil in anything, teh carbon will wear everything to buggery, iv seen to many machines with leaking rams where the carbon has worn teh seals, it will clog the oil pump in saws up, and id dare say wear teh buggery outa ya slabbing bar. the bearing idea would work if the carbon was all in nice round little balls but i doubt that would happen very often.

The carbon suspended in the oil should just act like graphite.

Originally Posted by sgschwend

The carbon suspended in the oil should just act like graphite.

Not necessarily. Several of the researchers where I work are studying this and they tell me the forms of carbon produced by diesel combustion are very varied and many and the amount of graphitic carbon formed is very small. Soot mainly consists of small clumps of even smaller clumps of elemental carbon which in turn consist of typically 30 nanometer balls and strings of carbon plus quite a bit of unburnt fuel or fragments of partially burnt fuel. If it were all 30 nm carbon balls then that would be fine as they would act like ball bearings but it's not and it can still cause damage if not removed from the oil. These particles are so fine that normal oil filters will not remove them all. However oil filter technology has improved markedly over the last few years and are now very good an example of how good they are is that some diesel engines can run for 45k km between services. The problem with buying used diesel engine oil is that one has no idea from which sort of engine it has come from

BTW the same particulates are present in diesel engine and in jet plane exhaust which we all breath in. The amount of soot produced by burning petrol is much less, instead petrol produces more CO2 and other nasty stuff.

A couple of years ago I sat on a plane to europe next to a Swiss engineer who was designing soot exhaust filters for motor vehicles. He was telling me about one type of filter he was working was a large piece of porous ceramic that because it was filtering exhaust sat at ~500ºC. When it came close to blocking, the method used to clear the filter was to squirt a single drop of raw petrol onto it. Being at 500ºC there was a small explosion which instantly turned the filtered soot mostly into CO and CO2. He said the explosion sounded like a small backfire. The explosion was required about every 200 km or so to prevent the filter from blocking completely. During the explosion the ceramic got very hot so after a certain number of k's it needed to be replaced. He didn't say how many but he indicated that it would become part of the car's major service so maybe 50k kms. The cost was as yet unknown. The explosive nature of the process required a reasonably strong combustion chamber which also added a small extra cost to the car. What they really wanted to filter was diesel truck exhaust soot but these filters would not be practical for big trucks because they would have to be replaced too often. Either was it was one of the most interesting plane trip discussions I ever had.

Carbon that is the size of a few nM? Pretty tough to catch that in a filter.

I believe you want the carbon to be in either the form of balls or like graphite in the form of strings. The string layers have weak bond forces which allow the layers to slip by each other making it slippery.

I would guess that any damage is generated by other materials such as silica, picked up from the air intake.

Folks have made a good point about the risk of using used oil due to the unknown nature of the materials suspended in it.

Caltex depot in toowoomba,but now im just using engine oil,new that is,dont know why but every time someone askes about oils ,and what i use ,its assumed that it is sump oil,dunno i must look dodgey lol lol

About 10 years ago I used diesel sump oil as bar oil and I had no particular problems. The main reason I went away from it was that I tired of the dirty black substance that it is. It seemed to get everywhere.

Regards
Paul