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Oil Change Frequency: BF I6 


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 Post subject: Re: Oil Change Frequency: BF I6
Posted: Fri Aug 02, 2013 1:51 am 
ACT Cruise Moderator
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Age: 36

Posts: 6275

Joined: 24th Nov 2004

Ride: '06 BF GT-P

Power: 293 rwkw

Location: Canberra
ACT, Australia

Ashhubb wrote:
Man, i didnt join this forum to have a petty argument, i cant be bothered explaining this s**t to you tyre kickers so i just coppied and pasted some simple, should have learnt when you were 10 information.

When motorists are asked: "Why does motor oil need to be changed?" the most common answers are:

It gets dirty

It breaks down

Because my mechanic told me

Amazingly all above reasons are WRONG !

And here is why:

In modern fuel injected electronically controlled engines with "sealed" crankcases there is no way that "ambient" dirt can get into the engine oil. Only if AIR FILTER is defective (torn or improperly installed or missing) or PISTON RINGS are excessively worn or broken, small amount of "dirt" can be introduced into the engine lubricating oil.
(For more info go to: Dirty Motor Oil in Q&A in Publications)

The Hydrocarbon Oil in its pure form is quite stable chemical, after all it has been in existence for millions of years before it was introduced into your vehicle. Almost no amount of pressure or mechanical stress will "damage" the oil molecules. Interaction with other chemicals, extreme heat and availability of oxygen will cause oxidation, formation of gum, varnish and sludge, but not a "Break Down". The long chain polymer molecules that are present in most multi-viscosity oils to give them high viscosity index, can however shear under stress and become shorter or smaller molecules. This loss of multi-viscosity property is sometimes referred to as "Viscosity Break-Down" a term that was introduced by CASTROL in their GTX Motor Oil commercials.

Unfortunately most mechanics are NOT Automotive Engineers, are NOT Lubrication Engineers, are NOT Tribologists, are NOT Chemists, are NOT Rheologists.
One needs all of above to determine if any Oil needs to be changed. Also since such TEST can cost from $10 to $100, depending on accuracy and complexity, it is more convenient to change oil at some arbitrarily determined interval.

There are two reasons why lubricants need to be changed periodically:

The most important reason is chemical change of the lubricant itself. The lubricant looses its lubricating capacity due to chemical decomposition of the oil itself and due to depletion of the chemical additives that are present in modern oils. The more severe are the operating conditions, the faster does this change occur.

The second reason is removal of wear particles that are present in the lubricant and which can not be removed by normal filtration. The greater the loads to which the mechanism is subjected the faster is the wear and more wear particles are present in the oil. Frequent starting and stopping of the engine, especially in winter, also increases wear and formation of "cold sludge".

If you're going to rip off "bob the oil guy" at least quote the site, don't post it as your own.



1998 DL LTD in Sparkling Burgundy, daily, 302W, stereo, slow - 97.5rwkw
2006 BF GT-P in Ego, mods. 293rwkw - 12.427@109 - 0-1000m 24.838@221

 Post subject: Re: Oil Change Frequency: BF I6
Posted: Fri Aug 02, 2013 10:48 am 
Fordmods Newbie

Age: 31

Posts: 10

Joined: 22nd Sep 2012

Location: Sippy downs
QLD, Australia

Have a read up top, it says its coppied and pasted
 Post subject: Re: Oil Change Frequency: BF I6
Posted: Tue Aug 06, 2013 8:03 pm 
Getting Side Ways
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Age: 28

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Ride: '14 Grand Cherokee

Location: Port Lincoln
SA, Australia

data_mine wrote:
Ashhubb wrote:
The whole purpose of oil is that it sticks to the crank bearing, valve springs, push rods etc thats why the viscosity matters. In simple mans terms if it is runny like water it aint gonna stick to stuff and lubricate it. So that means the viscosity is all that matters! Who cares if its dirty lol as long as it lubricates!

oh s**t, the oil I put in is runny like water.

At least you dont own a PX model petrol Ranger. They specify 0W20 full synthetic. how many courier mobs are going to use that for their fleet vehicles? that s**t expensive! lol



11/93 ED OPT20 GLi | Full Boat Spec

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