306 1.9TD Benefits of Engine Oil??????????

Hi,
Just did an oil change on my 1.9TD S reg 306. In the Haynes manual think it
says 10w40 or 15w40 cant quite remember. Anyhow I bought some 10w40 from
Halfords and is said nothing bout Turbo engines infact it said suitable for
non turbo.....So I got 5w40 fully synthetic oil cos it said suitable for
turbo and demanding driving, which at present I'm driving long motorway
distances at speed....
Anyhow is this ok or not? What are the benefits of using a 5w40 if any?

Oh and while under the car I looked at the discs and I would have thought
they should havea smooth groove in them which had been worn away by the pads
but when i ran my finger over it it seemed quite bumpy is this normal? as im
getting them replaced soon..
Cheers
Oli

 

Dont really know a lot about oil ratings and what they mean, i am sure
someone will give you a better answer about those but i have to
recomend the castrol magnatec gtd range.

i started as a bit of a sceptic at first but thought i would give it a
go an have to say i have never looked back. mine seems much perkier
and a lot quiter in the morning than with standard oil. mines a 306
1.9d non turbo, which i know is different to yours but hey, in my
opinion it is worth the few extra quid

 

this 5w40 was bout £30 odd quid instead of £11.99

 

5w is thinner when hot than 15w. it may be too thin to give protection at
temperature.

 

any?

I can recommend Castrol GTD available from Halfords and it only costs
about £14 for 5 litres. My 1995 306 XTdt has been running on it for
over 120,000 miles and I've never had a problem with the engine or
performance. I'd say that its not so important about the type of oil,
rather just make sure it's replaced regularily. Because I generally do
over 20,000 miles a year, it was never more than a few months before I
needed the oil changing (6,000 mile interval). As another poster
mentioned, perhaps better oils do reduce startup engine noise a little
but to be honest this has never been an issue for me.

I guess if you are getting them replaced soon you needed worry about
the current discs. Some people have had vibrations whilst braking
after having their discs replaced. Unless you have a good reason for
wanting to changing the discs (i.e. poor performance or just
dangerous), I'd advice you leave them alone!

Stuart
http://www.radox.freeserve.co.uk/306.htm

 

Hello,

It does, and some can improve fuel economy, because they are thinner.
IMO, a good basic oil for a 306 TD would be a semi-synthetic 10w40, like
Esso Ultra (may be called a different way) or Total Activa 7000.

My brother runs Esso 10w40 Diesel / Turbo-Diesel on his '90 205 DTurbo,
20,000 miles / year, mostly motorway / road, no problem.
Damn easier to answer for HDis

 

The oil specification is not only the 10w 40 etc, it's the C or S that you
should look at.

C ( such as CF, C etc) refers to Diesel engines ( Comercial) .
S ( SG, SH etc) refers to Petrol ( S?)

These letters refer to the wear characteristics ( higher the letter the
better the protection ( CC= bad CH = good etc)

I would guess the synthetic you purchased was a lot better on engine wear
and carbon removal etc than the £11.99 stuff.

 

I thought that the C and S referred to the method of ignition, i.e.
Compression and Spark..