Thu May 22 17:47:13 1997
- Message No. 887
From: "Robert Rowe"
Subject: Re: About oil
Robertson Philip wrote:
> >[I'm confused - can you explain this - I always thought the reason
> that cars
> >went from 10k service intervals to 20k was due to the introduction of
>
> >synthetic oil?]
The service interval increase wa as a result of customer demand and not
because the technology allowed.
In part, superior quality oil is one of the reason that service
intervals increased.
However other things had to be done as part of this. One was an increase
in the life of oil filters and the second was a switch to oils with
incrased addatives that would not be depleted over the longer oil change
period.
Another thing that has allowed the service interval to increase is
better piston sealing so that combustion products don't get into the
sump. Carbon deposits in the sump were a major cause of lubricants
loosing their effectiveness. ( This is one of the reasons Indirect
Direct Injection Diesels have such short service period )
Another factor that has come in is the increased use of oil coolers in
cars.
Another little trick they've employed is to increase the volume of oil
in the engine, engine oil capacity is now much closer to 5L than it used
to be and I have it from a friend in the industry, there is a move to
start selling car oil in 5.5L containers.
Sorry, you've rather got me on one of my subjects.
Rob
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