Oil for Saab 99 -84

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Mikael Johansson - 11 Jun 2005 14:10 GMT

Hello!

I wonder how much oil it's supposed to be in a saab 99 from -84 and what
kind it should be? (liters)

WFR: Mikael J

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jb - 11 Jun 2005 16:00 GMT

> Hello!
>
> I wonder how much oil it's supposed to be in a saab 99 from -84 and what
> kind it should be? (liters)
>
> WFR: Mikael J

hi 3.7 litres (including filter).

I always ran a good 15/40 mineral oil in the UK..Or maybe 10/30 in colder
climes.

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Craig's Saab C900 Site - 11 Jun 2005 22:09 GMT

>> Hello!
>>
>> I wonder how much oil it's supposed to be in a saab 99 from -84 and what
>> kind it should be? (liters)
>>
>> WFR: Mikael J

>hi 3.7 litres (including filter).

>I always ran a good 15/40 mineral oil in the UK..Or maybe 10/30 in colder
>climes.

My C900's which have B201 engines have both just had oil/filter changes (the
1985 900i had awful oil - must have not been changed by the previous owner
for a while), and I've use Shell Helix Ultra to replace the old oil. Some of
the SCCA members I've asked about oils have recommended it, so while it's
not cheap (A$55 for 5 litres), I figure it's going to be better for the
engines in the longer term.

Both engines had an oil flush product added and the engine run until it was
warm before draining.

On a related issue - it's interesting that people are talking about 99's
made in 1984. Did 99's post-1980 make it into all of Saab's markets at the
time, or only in Europe?

Regards,

Craig.

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Craig's Saab C900 Site - 11 Jun 2005 22:10 GMT

>> Hello!
>>
>> I wonder how much oil it's supposed to be in a saab 99 from -84 and what
>> kind it should be? (liters)
>>
>> WFR: Mikael J

>hi 3.7 litres (including filter).

>I always ran a good 15/40 mineral oil in the UK..Or maybe 10/30 in colder
>climes.

Another related point - what do those numbers mean? One is the viscosity I
think, but I'm not sure what the other one is.

Regards,

Craig.

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Pooh Bear - 12 Jun 2005 03:09 GMT

> >> Hello!
> >>
[quoted text clipped - 10 lines]
> Another related point - what do those numbers mean? One is the viscosity I
> think, but I'm not sure what the other one is.

As I understand it it's the viscosity cold and hot. You want low viscosity cold so
that the oil gets round the engine and all the bearings fast. When hot you don't
want the oil to 'thin' too much. The numbers relate to the SAE method of
calculating viscosoity IIRC. So you want a low number followed by a higher number.
I have to admit I'm no expert.

One thing that does puzzle me is the wide variety of grades of Mobil One. I'm sure
there's one that's 0W/60. More routinely 5/50, 10/40 ? Never previously seen zero
in an oil spec like that. Which one to use ?

Graham

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Malt_Hound - 15 Jun 2005 00:26 GMT

>>>>Hello!
>>>>
[quoted text clipped - 22 lines]
>
> Graham

Graham,

Yeah, you've got the gist of it. First number is the comparative
viscosity of the oil to a *straight* weight oil at cold temps, while the
second number is the comparative viscosity to a straight weight oil at
high temps. Ideally, oil would be extra thin at start-up and get
thicker as the engine temp increases, but that just ain't the real
world. So instead we strive to get the widest range between those two
numbers that meets with the engine manufacturers requirements and
doesn't have so many additives (to achieve these miracles of viscosity)
that the stuff falls apart under actual conditions inside the engine.

-Fred W

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