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Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you.

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Old 7th June 2007, 10:49   #181
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No need to flush, just drain and replace.

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Old 8th June 2007, 18:13   #182
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is 5w30 ok? for a track/road VTR
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Old 8th June 2007, 18:15   #183
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Originally Posted by D34no View Post
is 5w30 ok? for a track/road VTR
5w-30 or 5w-40 but I think 5w-40 would be the preferred choice

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Old 16th June 2007, 12:37   #184
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What oil should I use for my 1.4? It is on 85K miles. I am regulary using high revs

Cheers Oilman (or anybody else that could help)
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Old 16th June 2007, 13:46   #185
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A 5w-40 would be a good choice

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Old 16th June 2007, 14:07   #186
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Quote:
Originally Posted by oilman View Post
A 5w-40 would be a good choice

Cheers
Guy
Was that reply aimed at me buddy? lol

I am slightly confused by all these varitions in oil. In the halfords oil book, it says that I should used 15w - 40... Is that thinner or thicker than 5w- 40? Sorry if that is a really dumb question
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Old 16th June 2007, 14:39   #187
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The difference is the cold crank, the lower the better.

If you see an expression such as 10W-40, the oil is a multigrade.

This simply means that the oil falls into 2 viscosity grades, in this case 10W & 40.

This is made possible by the inclusion of a polymer, a component which slows down the rate of thinning as the oil warms up and slows down the rate of thickening as the oil cools down.

It was first developed some 50 years ago to avoid the routine of using a thinner oil in winter and a thicker oil in summer.

For a 10w-40 to attain the specification target a 10W ( W = winter) the oil must have a certain maximum viscosity at low temperature. The actual viscosity and the temperature vary with the viscosity grade but in all cases the lower the number, the thinner the oil, e.g. a 5W oil is thinner than a 10W oil at temperatures encountered in UK winter conditions.

This is important because a thinner oil will circulate faster on cold start, affording better engine protection.

For a 10w-40 to attain the other specification target a 40 oil must fall within certain limits at 100 degC. In this case the temperature target does not vary with the viscosity grade, if there is no "W", the measuring temperature is always 100degC. Again the lower the number the thinner the oil, a 30 oil is thinner than a 40 oil at 100 degC., which is typical of maximum bulk oil temperatures in an operating engine.

The engine makers are, of course, very well aware of this and specify oils according to engine design features, oil pump capacities, manufacturing tolerances, ambient temperature conditions etc. It is important to follow these guidelines, they are important and are an are stipulated for good reasons.

If the engine has been modified, the operating conditions may well be outside the original design envelope. The stress on the oil caused by increased maximum revs, power output and temperature may indicate that oil of a different type and viscosity grade would be beneficial.

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Simon
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Old 16th June 2007, 14:50   #188
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So if 5w - 40 is a thinner oil, surely at high revvs it won't protect as much as 15w-40?

I pretty much understood half of what you just said mate. Great answer, but the dummy reading it isn't too hot on his engines
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Old 16th June 2007, 18:10   #189
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Nope, when hot they are both 40, sae 40 and the same thickness at 100degC

14cst (centistokes)

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Old 17th June 2007, 12:02   #190
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hi,

1999 VTS - 74k miles
Induction Kit/ Re-mapped
road use only

Thanks
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Old 17th June 2007, 16:29   #191
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Synthetic 5w-40

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Guy
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Old 17th June 2007, 21:51   #192
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Hey Guy / Simon

My 106 GTi has done 100k miles now, only recently got the car checked the oil the other day and it seemed a bit blacker than it should, the hydro tappets are a bit noisy to so time for a change!

So what should I go for? 5/40 or 10/40? and what brand? Car just had usual manifold, exhaust and piper 270s in.

Thanks
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Old 18th June 2007, 10:59   #193
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Quote:
Originally Posted by Sophia_Bush View Post
Hey Guy / Simon

My 106 GTi has done 100k miles now, only recently got the car checked the oil the other day and it seemed a bit blacker than it should, the hydro tappets are a bit noisy to so time for a change!

So what should I go for? 5/40 or 10/40? and what brand? Car just had usual manifold, exhaust and piper 270s in.

Thanks
Hi,

It depends on how good you want to go and how much you wish to spend.

The cost option is for a 10w-40 semi synthetic with very regular oil changes. The quality choice is for a 5w-40 and 0w-40 full synthetic and these last a lot longer.

Brand wise, our favorites are Silkolene, Fuchs and Motul.

Cheers

Guy.
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Old 18th June 2007, 21:32   #194
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I do not have a problem spending money if it means my engine will run quieter/better/last longer!!

As I say the hydro tappets are a bit noisy so I think a good 5w-40 would be ok?
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Old 19th June 2007, 10:45   #195
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Indeed 5w-40 will make an ideal choice.

Cheers

Guy.
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Old 28th June 2007, 22:31   #196
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Default Which oil?

Hi, I was wondering what oil you would reccomend for my Saxo, the spec is as follows:

2000 vts
Newman PH3 cams
Slightly worked cylinder head
Carbon air box
Magnex exhaust
Fresh engine, completely rebuilt and not yet run

The car will see some road use but also track work and tarmac rallying too.

Thanks a lot
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Old 28th June 2007, 22:44   #197
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Which oil oilman ?

2000 90bhp VTR
Magnex cat-back + gmc manifold
standard intake
Thrashed around counrty lanes most days for a good 20 mins +
then used to get to work on dual carriage way at 50mph
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Old 29th June 2007, 09:50   #198
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Quote:
Originally Posted by jstimpson1 View Post
Hi, I was wondering what oil you would reccomend for my Saxo, the spec is as follows:

2000 vts
Newman PH3 cams
Slightly worked cylinder head
Carbon air box
Magnex exhaust
Fresh engine, completely rebuilt and not yet run

The car will see some road use but also track work and tarmac rallying too.

Thanks a lot
Hi,

To run in use a 10w-40 semi, run for around 1000 miles. Once run in a 5w-40 synthetic, for competition use the ester based synthetics of Silkolene and Motul.

Cheers

Guy.
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Old 29th June 2007, 09:52   #199
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Quote:
Originally Posted by Steve_VTR View Post
Which oil oilman ?

2000 90bhp VTR
Magnex cat-back + gmc manifold
standard intake
Thrashed around counrty lanes most days for a good 20 mins +
then used to get to work on dual carriage way at 50mph
A good 5w-40 synthetic is ideal, these dont cost the earth and are much better then a semi.

Have a look at Fuchs and Motul 8100.

http://www.opieoils.co.uk

Cheers

Guy.
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Old 29th June 2007, 22:17   #200
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Quote:
Originally Posted by oilman View Post
A good 5w-40 synthetic is ideal, these dont cost the earth and are much better then a semi.

Have a look at Fuchs and Motul 8100.

http://www.opieoils.co.uk

Cheers

Guy.
thanks, does oil affect performance? oils still clean but car running a bit shat

what about gearbox oil aswel mate?
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