If it is the car in your sig, not suprised your not using 0w. However for a standard road car it is fine.

Cheers

Guy

 

About a year ago I asked Millers if mixing different grades of their CFS range was ok and they saw no problem and aggreed it would change the effective viscosity of the oil.

JohnD

 

I do not agree Guy - sorry.

Almost everytime I have seen someone post up about blown older engine it is because they are following someone's bad advice and using 0W/40... I am sure most engine builders on here have more experience at putting together the pieces on what works and doesnt work. Sure they don't mind the ready supply of rebuilds that people using 0/40 is giving them though.

 

Is fully or semi synth better ?? Was going to use Mobil Super S 10w 40 at the next change ??

 

You should use whatever your engine has been using before -- if it has been using just semi-synth for an extended period of time, then there's no real value in switching to fully synth in an attempt to try to magically decrease engine wear from that point on.

Otherwise fully is superior to semi -- a fully's molecular structure stays in grade for a longer period than semi or mineral oils. Also, the Subaru flat-4 engine likes the fully synth 100% Ester type oils.

 

Yes and no. If the engine is knackered, then a synthetic isn't going to magically make everything better, but if it's been well serviced, it may help you get a few thousand more miles out of it. Also, if you want to use the car on a track, it is worth changing to a synthetic as it will take a lot more abuse than a semi, so you don't need to change is too often. It can work out cheaper than a semi becauseof that

 

Thanks Guys, so a 10w 40 is good for 51k miler ??

 

agreed.....

 

What would you use JGM ?

 

15W50 motul 300v comp..

used it in all my imprezas.. one went to 200,000miles and engine still fine when upgraded, ran on anything from 215bhp to 620bhp and no issues oil related or excessive wear related.

Simon

 

Right! I'm using this from now on! lol

 

No point going over old ground, but we have many customers using 0w-40 without issue and have been for sometime.

Cheers

Guy

 

Its a great oil, but for a standard or near standard car 15w-50 is just not needed.

Do people not look in their handbooks anymore?

Cheers

Guy

 

Motul 300V Competition 15w50 Oil 2 Litre on eBay (end time 03-Oct-09 14:06:30 BST)

MOTUL 300 V POWER RACING OIL 15w 50 ESTER SYNTH 1 LITRE on eBay (end time 10-Oct-09 11:06:15 BST)

Is £70.88 a good price for 5 litres delivered?

 

Guy, does a 0W-xx oil leave enough residual oil film between bearing/journal surfaces overnight, to be considered okay? Or is it too thin?

 

What's your favourite Sorry if I've missed it, if youv'e said before

 

What car do you drive Guy ?

 

Yes, not a lot of difference between 5w and 0w in the UK.

Cheers

Guy

 

Ive got a few favourites, Im into my Redline at the moment.

Cheers

Guy

 

Daily hack is a diesel Leon.

Ive given up wasting my money on cars, I now waste it on boats.

Cheers

Guy

 

What viscosity

 

Will have to agree to disagree on this one then.

I would love to see some factual evidence on why a "0w" oil has damaged an engine, and how it did it.

Cheers

Guy

 

If yours is a 2002 model and not excessively modified I would go 5w-40.

Cheers

Guy

 

No not excessive - cheers

 

Just read the Millers Oil manual today and they recommend 10w-60 for a 2000- Subaru WRX/STI.

Jesus!!!!!!!!

 

AAAAAAAAAAAAAARGGHHHHHHHHHHHHHHHHHHHH !

 

Castrol website recommends 5w30 as does my cars logbook I think. Those guidelines will be probably for brandnew standard engines mind.

 

the big ends suffer in a subaru engine.. why risk using an oil that should be okay when you can use better?

Simon

 

read your operator manual! thats what its there for. my classic manual says i can use 5W-30, 10W-30 or 10W-40. it goes on to say that 5W-30 is not recommended for sustained high speed driving. too thin.

 

I'm 100% that the manual doesn't even mention 10w-60

Cheers
Guy