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- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!rphroy!link.ph.gmr.com!vbreault
- From: vbreault@rinhp750.gmr.com (Val Breault)
- Newsgroups: rec.autos.tech
- Subject: Re: Pre-luber summary & Oil Changes
- Message-ID: <VBREAULT.92Aug31093946@rinhp750.gmr.com>
- Date: 31 Aug 92 13:39:46 GMT
- References: <15200042@hpspdla.spd.HP.COM>
- Sender: news@rphroy.ph.gmr.com
- Organization: General Motors Research Labs
- Lines: 87
- Nntp-Posting-Host: rinhp750.gmr.com
- In-reply-to: paulw@hpspdla.spd.HP.COM's message of 28 Aug 92 16:19:23 GMT
-
- In article <15200042@hpspdla.spd.HP.COM> paulw@hpspdla.spd.HP.COM (Paul Welch) writes:
-
- Thanks for all of the responses to my question about pre-oilers.
-
- For my part, you're welcome.
-
- <much good stuff deleted>
-
- Finally, I'd like to plant another seed for some more discussion.
- Being an engineer, I've been taught that you make guesses based on
- theory, and make decisions based on DATA. Where is the data for
- the suggested frequency of oil changes??? I'd especially like to hear
- from our friend at the GM research center on this one.
-
- Hmmm.... I guess he means me.
-
- I do not have that information handy Paul, but I will tell you via
- private Email where to write for it.
-
- I'm pretty sure that you'll get an answer like "it depends". It depends
- on the average and peak temperature of the oil. It depends on the
- kind of driving. It depends on the weather...... it depends.
-
- Since most folks don't have access to a chemistry laboratory but every
- car has an odometer, the folks that build and warrant the engines came
- up with the mileage method. It's not exact. It may not even be close.
- But it does provide a safe margin for error and it is easy to figure out.
-
- Or from someone
- at a petroleum company. A very close friend's father used to work at
- a petroleum product analysis firm, where, among other things, they
- analyzed oil from various motors and equipment. He was also a pilot,
- and a certified airframe and engine mechanic. He preached the
- following: Oil doesn't really ever need to be changed. I know that
- this is a RADICAL concept for most of us. He said that with todays
- quality lubricants, the only real loss that all the analyses showed
- was that the ADDITIVES tended to dissipate or fail in the oil.
- Just adding new oil when the motor needed it, and CHANGING the filter
- regularly, was all that was really required. I'm sure the folks at
- Pennzoil wouldn't agree!!! Of course the $64 question is: would I
- try this? Don't know yet, not enough data !!
-
- Your friends father is (mostly) right. This presumes that the engine
- leaks or burns oil at a sufficiently high rate that replacement oil
- is put back into the engine at an adequate rate. (Where did I learn
- to write like that???) Let's try that again.... If you have a very
- tight engine doesn't leak oil and doesn't burn oil then the rate of
- replacement will be quite low. The old oil with the exhausted
- additives will lubricate the engine quite well, but the anti-corrosive
- additives will be depleted and the acidity of the oil will rise.
- I suppose that if you had access to a chemistry lab you could monitor
- the condition of the oil and determine precisely when your oil needed
- changing. Alternatively you could follow the old rules of thumb and
- change it before it was absolutely necessary.
-
- As long as anyone is under there changing the filter they should spend
- the extra 6 minutes and 6 dollars to assure that the job is done as
- close to "right" as they can get. It's the CHEAPEST way to engine
- longevity that I'm aware of. Every single engine that I've seen with
- exceptionally high mileage has had a regular oil change schedule for
- most or all of its life. There's no gimmic, there's no potion, there's
- no substitute for good lubrication. That doesn't end at lubricating
- the engine. The suspension, the door hinges, the linkages, the
- transmission.... If it *CAN* be lubricated, it *SHOULD* be lubricated.
- Become a lubricant fanatic and you'll become the proud owner of very
- long lived and well running "things".
-
- (Every summer when I cart out the electric fans I disassemble them,
- clean them and lubricate them. I'm still using the fan my grandmother
- used. It was old when I was born and I'm now well into my fourth
- decade... As a younger man I worked in a machine shop that was
- populated with ANCIENT but well running machines that were converted
- from central power.... The boss was a lubricant fanatic too.)
-
- I know that you agree Paul, I just wanted to say it once again while
- I had the soap box. I'll climb down now and let the next person
- have it for a while.
-
- -val-
- --
-
- Val Breault - vbreault@gmr.com - N8OEF
- General Motors Research and Environmental Staff.
- The opinions expressed by the author do not necessarily reflect
- those of the GMRES or the General Motors Corporation.
-
-
-