Peanuts

iTrader: (15)

clarification:
Im not totally happy with cold starts on my 300V 15W50, cant fault its operating performance when up to temp.
Changing to 5w40 motul300V or silkolene pro will be better for my morning run.
both oils are good grade and the decision could be down to price alone.

\/\/\/\/\/\
is that about right?
whats the going rate for 4.5/5L delivered to the south of England please?

Peanuts

iTrader: (15)

addendum....
in the summer months Ill be straight back on the 15w50 300v.

oilman

iTrader: (9)

Peanuts,

YHPM

Cheers

Simon.

Tone Loc

iTrader: (1)

Got my ProS (10W/50) from Simon (thanks for the quick service )... so we shall see if the cold start diesel noise stops. Fingers crossed.

Tony.

RaymondH

Simon

Do the same recommendations hold true for 5W-40 and 10W-40 in modified engines? Mine has 300+ bhp (ie 50% more than standard) and does ca 3000 miles per annum on Mobil 15W-50 which is changed every 6 months and I'm a bit uneasy about cold starts. The car is a MY98 Turbo and has road use only (although it regularly gets a bit of stick!!). Thanks.

Grovit

This is a truly excellent thread - have just read all 5 pages and although quite a bit of the info goes over my head, I'm grateful for the simple explanations given by the contributing people - cheers folks .

Just a quick question though - I live in Scotland where it is considerably colder, considerably wetter for considerably longer than say south England - would this effect oil recommendation...or would the differences in environment be negligible for a road car.

I'm currently using 10w 40 Magnatec in a 1997 UK un-modified Soob.

If I'm way off beam with this oil - please can you advise - also I'll take a look over in the group buys section as I noticed somewhere that it said it had been extended through Feb. If I can't find it, I'll be back to ask for a link.

Cheers
Chris

Dark Blue Mark

Magantec's not a good oil to use on a turbo car (semi synth), its not up to the temps involved - esp if its modded. many do use it with no issues, but its not worth the risk given the price difference for a quality fully synth.

Interestingly the actual API/ACEA specification of the oil requested by Subaru is fairly standard and they do not actually specify full synthetic oil

Another point of note is that I had a chat with Castrol technical dept, as I have access to the guys who perform tests on various cars, and they advise to not touch 0W's with a barge pole - which I agree with.

MB

oilman

iTrader: (9)

Indeed, 5w-40 is fine so long as it's a proper synthetic one and you are not running excessive temperatures. (above 130 degC)

If you are uncomfortable with sae 40 then use 10w-50.

Cheers
Simon

oilman

iTrader: (9)

Chris,

Just two pointers really.

A 5w-40 synthetic will give you better cold start protection as the oil flows more easily and this is where the majority of the wear occurs.

Semi-synthetic is ok as long as it's changed regularly but will not give as good levels of protection as a fully synthetic.

Hope this helps

Cheers
Simon

oilman

iTrader: (9)

Apart from VAG who give codes for their oil, most OEM's merely specifiy a spec and leave the quality to the owner.

In many cases a minimum spec is supplied however this is changing more and more as manufacturers see the benefits of the longer oil change periods for synthetics which of course makes their headline "total cost of ownership figures better" due to fuel economy etc.

Cheers
Simon

OZWRX

Is halfords own make fully synthetic any good for 93 WRX ?


Regards
OZ

oilman

iTrader: (9)

It would be if it was a fully syn. It's a hydrocracked oil.

Use the good stuff and change it less often.

Cheers
Simon

Grovit

Cheers for your help

Simon - YHPM.

vindaloo

Car was on Shell Helix 10w40 semi-synth when I got it.
One service using castrol RS 10W60 synth.
Last two services using Shell Helix 5W40 synth.

mutant_matt

Simon,

You keep mentioning xy & z is ok up to 130DegC. What if you are getting up to 130DegC? Do you need to go to something like Castrol RS 10/60?

Matt

oilman

iTrader: (9)

Matt,

I guess you don't mean in normal driving. On track days for prolonged periods?

The 130degC is a safe margin number, the reality is that they can withstand the following temps for prolonged periods:

Silkolene PRO S 5w-40 = 140degC
Silkolene PRO S 10w-50 = 150degC

This information was given to me by the Silkolene Chemist.

Cheers
Simon

mutant_matt

OK, ta, sounds good. It's on the 'Ring where it peaks each lap at 130 (about 3/4 the way round) but moves between 110-125 for the rest of the lap, the for the rest of the next lap until the same point.

If I was doing enough miles this way, I'd upgrade the oil cooler....

Matt

Dark Blue Mark

I would upgrade it anyway if I was doing the ring regularly!

MB

paul w

Hi Simon,

Do you know anything about havoline 5/40 fully synthetic as i can get hold of this at a good price.There is some spec on the website but it wont let me copy,maybe you could take a look please.

Cheers Paul

Bob Rawle

If a subaru engine gets the oil up to 130 deg C then THERE IS SOMETHING WRONG, Simon you are inadvertantly advocating that this is safe WHEN ITS NOT.

I ran Vauxhall Cav turbos for several years and used Mobile 1 0-40 with no issue, it regularly saw 140 deg on the track again with no issue, if a Subaru engine saw those temps then it would die. No problem for the oil, BIG problem for the Subaru engine.

yes again a little harsh.

bob

aggs

Thanks for the thread guys,I think I now have a grasp of the facts, 5W 40 good quality oil all year round. As previously stated on a different thread can really notice the difference on cold start,which is good because I am sure the missus goes over 3000RPM bit to quickly before fully warmed through.

Have a small question if cruising on the motorway at 100 /110MPH for LONG periods I have read that the air stream bounces over the scoop and cooling is less effective, has anyone got data on oil temps and at what length of time this temperature raise starts occuring. Will temps start reaching 130 degrees??
Or am I just worrying too much.

Aggs MY2000 Classic

Dark Blue Mark

Worrying a luttle too much, but good to be aware of it. Scoobs dont like sustained high speeds, not what thery're designed for. A lot of people have had blow ups and there was a thread a while back which suggested that due to the aerodynamics, the air is deflected over the scoop at high speeds, think it was about 130mph though. Noticed the newage STi has a BIG scoop?

MB

vulnax999

iTrader: (7)

Air going into the scoop cools the charge air going INTO the engine, the engine / oil cooling is done by air going through the front water radiator.

Dark Blue Mark

Forgot to add that.

The blow ups are from a quick massive rise in charge temp.

MB

vulnax999

iTrader: (7)

Right, that makes sense!!

I was going to add "but if the inlet air warms up more chance of Det, ( although engine would also make less power with the hotter inlet air and ign retard)".

oilman

iTrader: (9)

Paul,

Give me the link and I'll take a look.

Cheers
Simon

oilman

iTrader: (9)

I believe the problem here is the seals or other parts of the engine are likely to expire before a decent oil. Perhaps you can confirm this Bob.

Cheers
Simon

mutant_matt

Thanks for that Bob!! On my STi I get about 100DegC on cruise or thereabouts. I'm using the Defi with the sender in No. 3 gallery and I still have the tray on and the car is, power wise, completely standard. Whaddya think?

The section where it gets up to 130 is a section where I have been within 1500rpm of the redline, in 3rd and 4th for about a minute. The rest of the lap, it's reving over a wider range, and mostly with lots of airflow.....

I guess at least I should take the tray off for the next visit and see how it goes. Luckily, I don't take the STi there that much as I have a dedicated track car that lives at the Ring and I mostly use that!

Matt

paul w

Here is the link Simon,there are some figures at the bottom of page.

Cheers Paul

http://www.havoline.com/images/produ...etic_5W_40.pdf

davedipster

Silkolene PRO S 10w-50 for me.
It's red which is handy, at least you know that the dealer has used it.

Dipster