Hey guys, just wondering what grade of oil I should use in my car? It's a 2015 wrx sti type uk.

Thanks 😁

 

A good quality fully synthetic oil I use a 10w50 or 10w60 but I have always been at the 400+bhp levels.SJ.

 

I use motul 300v competition 15/50 , subaru4u recommend it so that's good enough for me , I normally order through opie oils , oil change around every 5000 to 7500 depending on how oil looks

 

For a 2015 car, presume it's still new and fresh, I'd use 5/40 tbh. Unless older and tired with higher mileage then use a 10 based.
Check your book to what is says.

 

The car is only a couple of months old with low mileage so would like to use good oil as I'll be keeping it for a while. Thanks again guys. 👌👍

 

On the age thing mines had a recent re bore new Pistons etc so as a new engine , the lowest I would go would be a 10 I think 5 is too thin , then a 40 or 50 the upper side of it , I'm happy with a good 15/50 it's down to choice but I will never use a 5

 

A high quality 5w40 ester synthetic is the 'best' for a std car, we stock and supply the better options from Millers, Motul & Royal Purple and have year round deals that are normally more competitive than "others"

0191-4103770

 

I've just got millers 5w40 ester for my next oil change,would you say this is not advisable for a forged build which has done 30k? I thought it might quieten down the cold starts a bit?
Never though about using you to buy my oils,I'm sure you're very price competitive on oils as you are with everything else,mind you opie did have 15% offer on at the time I ordered.

 

A thicker 10 would quieten the cold starts, but if still rattly, then use a 15

 

Lol I've gone the wrong way then
I'm running 10w40 atm and thought the thinner 5w on cold would make it a little less slappy.
I like to do regular oil changes so might go with the 5w I have this time for a few thousand miles since I bought it anyway,see how it goes then go 15w on the next change.

 

For those in the know.....
This stuff is a step up from the very good Ester Sythetics mentioned.

https://www.facebook.com/Silverlineukltd/

 

thinner the better for cold start lubrication-5 weight for modern cars with tight tolerances is the norm...10 is fine also,wouldnt go heavier than that on a daily driver

now for oldies like my stag its no good on modern oil and needs 20/50

 

It might be better, but he's got a forged block which have slap as normal so I was quoting to that.

 

No I'm confused

 

 

I don't suppose either 5w or 15w will do any harm as long as I use quality stuff
I will see if it's any quieter on cold start with the 5w compared to the 10w I'm on now.

 

As said, you quoted you want to 'quiten' the cold starts on your forged engine, which I'm assuming you have a slight engine slap (which is normal on forged motors) a 5w is thinner so will let the engine rotate quicker and easier on cold but will theoretically make it more noisier if you are currently using 10w.
The 10w is fine, just get used to the slap or try a 15w50/60 depending on if big bhp.
Hth.

 

Yeh I expect a little slap when cold,doesn't really bother me,it does rack up a few knock events on ESL when I first start tho but was thinking of relocating the knock sensor as I've seen a few threads on people moving em to a slightly higher position.
I'm somewhere around 400bhp So not huge power. Maybe I should think about moving to a 50/60?

 

Have been doing specialist oils at VERY competitive pricing far longer than most others - no codes or other "specials' required to get the best pricing

 

Duly noted

 

I think oils are a very personal choice , the main thing is a good oil and sensible time between oil change

 

I would generally use a 5w-40 for one of those, but check your handbook as if it lists 5w-30, you might want to go for that to make sure there are no issues with the warranty.

We can beat pretty much anyone's price for specialist oils.

Cheers

Tim

 

I think Subaru use the 5/40 for economy as a thinner oil but not necessary better for the engine

 

of course you can................

as above most oils recomended by the manufacturer have more to do with service/fleet costs and potential economy rather than engine life...........

 

Thinner oils are often better for the engine as they flow faster and with less resistance, it tends to only be heavily modified engines that need thicker oils than standard.

 

Can I ask what you would recommend for a 400bhp fully forged would be,which has done 30k?
And am I wrong in thinking say for a 5w40 that the '5' is for when the oil is cold and the '40' for when the oil is up to temprature?

Car is running 10w40 atm but my last purchase from you is the millers 5w40(not put that in yet)

 

Hi

With it being forged, I'd probably go for a 10w-40 or 10w-50 ester synthetic, depending on what the car is being used for and how hot the oil is getting. 5w-40 might well be fine, but you might find it doesn't sound great on cold starts.

Yes, the w number refers to the cold viscosity (the W stands for winter) and the other number (SAE) is the hot viscosity. They are on different scales though.

Cheers

Tim

 

Thanks Tim
Yes it's pretty noisy on cold starts on the 10w40 (fuchs oil)
I got the millers 5w40 cfs from you this time to see if it would quieten it down a little on cold starts.

 

FYI I've put 10/50 millers cfs for a 450hp ish car should be ok for me depending how hot I get it, or I'll just jump to a 10/60 on track days.

 

Hi

A 10w-50 will be fine, it really shouldn't get too hot (150C+) for a 10w-50.

Cheers

Tim