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Subject:
Re: Oil Usage - members poll
From: "Mike G" <metier(at)lycos.co.uk>
Subject: Re: Oil Usage - members poll
Date: Wed, 3 Oct 2007 01:36:09 +0100
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"roy" <roy.williamson(at)gmail.com> wrote in message
news:1191354243.882425.3410(at)k79g2000hse.googlegroups.com...
>
> Thanks everyone. I`ve a 65 mile round trip to work. Put about 600
> miles on since the last top up. Last topped up with Mobil 0W40.
> I rarely really use the revs hard on the straight 6 but I do let it
> live a bit. Maybe some 5w30 would be a bit better. Or maybe my engine
> needs abit of work. The car is 2001 with 41k on. This ain`t looking
> good is it!. R.
No. I have a `96 525 SE with 180k. No oil needed between oil changes.
I also have a `97 528i with 170k. Again no oil needed between oil changes.
Having said that, all engine burn oil, but a good std engine shouldn`t burn
enough to need topping up between oil changes.
Any drop in the oil levels on my two cars is not really noticeable.
Mike.
SUBJECT: Re: Oil Usage - members poll
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From: "RustYŠ" <No.Mail(at)All.Thanks>
Subject: Re: Oil Usage - members poll
Lines: 48
Date: Wed, 03 Oct 2007 08:01:16 GMT
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"Fred W" <malt_hound(at)yahoo.com> wrote in message
news:9L2dnfqWr8PeNJ_anZ2dnUVZ_gidnZ2d(at)comcast.com...
> 5W30 is *thinner oil* than 0W40. The second number is the viscosity at
> running temp, and the only one that is significant when considering oil
> use.
>
And this tells you more.....
Multi-grade motor oil
The temperature range the oil is exposed to in most vehicles can be wide,
ranging from cold ambient temperatures in the winter before the vehicle is
started up to hot operating temperatures when the vehicle is fully warmed up
in hot summer weather. A specific oil will have high viscosity when cold and
a low viscosity at the engines operating temperature. The difference in
viscosities for any single-grade oil is too large between the extremes of
temperature. To bring the difference in viscosities closer together, special
polymer additives called viscosity index improvers are added to the oil.
These additives make the oil a multi-grade motor oil. The idea is to cause
the multi-grade oil to have the viscosity of the base number when cold and
the viscosity of second number when hot. The viscosity of a multi-grade oil
still varies logarithmically with temperature, but the slope representing
the change is lessened. This slope representing the change with temperature
depends on the nature and amount of the additives to the base oil.
The API/SAE designation for multi-grade oils includes two grade numbers; for
example, 10W-30 designates a common multi-grade oil. The first number
associated with the W (again `W` is for Winter, not Weight) is not rated at
any single temperature. The "10W" means that this oil can be pumped by your
engine as well as a single-grade SAE 10 oil can be pumped. "5W" can be
pumped at a lower temperature than "10W". "0W" can be pumped at a lower
temperature than "5W", and thins less at temperatures above 99°C (210°F).
The second number, 30, means that the viscosity of this multi-grade oil at
100°C (212°F) operating temperature corresponds to the viscosity of a
single-grade 30 oil at same temperature. The governing SAE standard is
called SAE J300. The motor oil grade and viscosity to be used in a given
vehicle is specified by the manufacturer of the vehicle.
Many new vehicles are marked to use 5W-20 oil (Honda, Ford, and more
recently Toyota). Some ultra fuel efficient and hybrid vehicles are marked
to use 0W-20 oil. For some selective mechanical problems with engines, using
a more viscous oil can ameliorate the symptoms, i.e. changing from 5W-20 to
20W-50 may eliminate a knocking noise from the engine but doesn`t solve the
problem.
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