First service, oil issue
 

Hi, I'm having trouble obtaining 15w50 fully synthetic for my wrx sti classic version 6. It's in very good condition but halfords seem to have sold out of the litre bottles and the 4 litre bottles. I've spoken to them over the phone and they say that it's been discontinued.

Could someone recommend what I'm supposed to be using for my car? It's standard and hasn't been modified.

Thanks!

You get the 15w50 motul 300v in 2ltr tins, you may be better off (especially in the cold) with a 5w40 or a 10w50 on a higher mileage engine.
Try www.opieoils.co.uk

Tony:D

PS, 10w40 semi synthetic is the standard oil, you can get millers 10w40 fully synthetic if you wish? (also available from the above ;))

i thought 15w was only good down to -15 degrees so not suitable for a British winter.

Shell helix ultra a good bet can get it from any petrol station too ;)

Id prefer to be using a 10w through the winter months anyway. I use the millers 10/50 available from opie as well

I use 5/40 in the winter and 15/50 in the summer.Currently using gulf competion from opie,it seems very good.

http://www.opieoils.co.uk/p-60123-gu...oil-15w50.aspx

Seems pretty cheap compared to the mobil one kind.. is this some kind of budget oil?

fuchs every time for me. Or possibly millers

I'll take your recommendation on the fuchs 15w50, I'm simply after a decent oil for road use.

Any objections? :)

no objections at all its your car.

I think its the wrong grade for a road only car. But many will have different opinions.

5/40
10/40
10/50

Not in that order is what i think you should be using. 10/40 being my preferred grade

5w40 would be as suitable (both my scoobs run this) as is the 10w40,, the 15w50 isnt recommened for winter use, especially in these conditions (i think you agree with me there ;))

OP, a 15w oil means it takes quite a while to warm up, hence a 5w or 10w are better.
So just to go over this as im not sure you understand this, the first number is the cold, the second the hot, lower the cold, faster it warms up, higher the cold, slower it warms (basic laymans terms, google it as it will give you a better anology), so running a 15w in sub zero temps really isnt a good idea.

Tony:)

yup i use 5w40 in the winter and 10w50 in the summer although with more track use this year i may go for 10w60

You wont need a 10w60 Don, the 10w50 will suffice for your track work ;)

Tony:)

ORLY?

What in the 15w oil makes it take longer to get warm than a 5w?

Bearing in mind the only difference between 5w and 15w how fast it flows at low temperature.

a 15w-40 takes no longer to warm up than a 5w-40.

With our temps hitting -15 at night though, I wouldn't want to crank my engine with 15w oil in it however.

Its simple physics, its thicker at cold but the same at hot, so when cold it will take longer to warm up.

Tony:)

Physics dicates that for a given volume of oil (base stock being the same 40) it will take the same amount of energy to raise its temperature by 1 degree. Thicker oil creates more drag (loss of power as more is converted to heat) which heats the oil faster than a thinner oil.

So yeah, physics does have the answer, just not your one ;)

The difference between a 5w-40 and 15w-40 is that a 5w has more viscosity modifiers to make it pour better at 0 degrees. A 0w oil is obviously a fallacy, but what it refers to is a lower than 0 degrees pourability.

a 0w/5w/15w-40 oil are all likely to use the same base stock, and less additives are more desirable as they leave less deposits on the turbo shafts, however, you need to balance this with being able to crank the engine on a cold winters morn

Que oilman??

Anyway, Ive just got delivered a nice big bottle of Fuchs Titan Race Pro S 10w/50 for the warmer months, Just waiting for it to get a bit warmer now, lol.

Popcorn tony ;)

TX.

i use millers xss as recomanded by opieoils .

costs about £23 for 5 ltrs from my local car shop