LEE P

Hi anyone running this oil in there scoob? done a few searches and it seems that everyone is going for 10/40 upwards, has anyone had probs with 5/40 grade? is mobil 1 0/40 just too thin for subarus? as Audi recommend it for all there turbo cars. cheers lee

Big Bear

I have used it in the past on a MY93 WRX , it is a good oil used by alot of circuit racers . I now use the 15/50 motorsport oil as used in the Subaru WRC ( so a Motul rep told me )

LEE P

Hiya big bear! well if its good enough for circit racers its good enough for me, did hear it was o.k from good source just wanted to know if the general public used it. ill go for 5/40 as winter is looming, does the motoersport one make it smoother or quieter? cheers Lee

Mike Tuckwood

The lower viscosity option is probably better for winter and a few 'spirited' drives. We keep 15/50 in stock and will be getting the other grades in imminantly.

LEE P

Cheers mike! was wondering where to buy the stuff if i wanted to do a mid eervice oil change. are you saying the thinner oil is only good for spirited drives? what about the occasionel trackdys? big bear was saying alot of people use this oil for racing. cheers Lee ill contact you for a price when i need some!

Bob Rawle

15:50 is the recommended grade by Motul themselves, you can also get it from demon Tweeks.

LEE P

cheers bob! i was just wondering how it works? was reading today that the first number (W) is the cold start viscosity, and the second number /40 say is the actual running temp viscosity? so if subaru recommended 10/40, surely any /40 would be suitable? and if its say 0/40 or 5/40 the cold starting would be more beneficial than a higher grade? as once the engine is warm they are all /40 and will do they same??? cheers Lee

carl

Mike -- you need to keep your website up-to-date with what you stock. I looked the other day and assumed you don't do Motul. I'm afraid it's too much for us Net-junkies to pick up the phone.

I was about to get 5l of Motul 15W/50 from Demon Tweeks, but if you're cheaper (than £47.09 inc VAT and postage) and can deliver before the end of the week I'll give you a bell tomorrow.

Edited to say the viscosities are measured at two temperatures (don't remember the exact numbers), but one is 'cold' which gives the 'W' (for 'Winter') rating and one is 'hot'. For 15W/50 what the 50 is saying is that the oil performs the same as SAE50 mineral oil at the temperature at which it is tested, which may not necessarily be the temperature it runs at in your car. The relationship between viscosity and temperature for a multigrade like 15W/50 is nothing like that for SAE50, even over a fairly narrow temperature range.

(This must be right -- I read it in a classic car magazine about 10 years ago )

HTH

[Edited by carl - 10/28/2001 10:17:30 PM]

WREXY

I could be wrong and someone correct me please, but I always thought the 2nd number, the largest, is the cold start grade (oil being thick) and the first number is when the oil reaches hot temperature (oil thinning out). I need to get this right.

Cheers,

Wrexy

[Edited by WREXY - 10/28/2001 11:06:48 PM]

nom

Nope, it's definately the cold one first, the hot one second (so cold/hot). And the whole measuring thing's more complicated than that 'cos it's set on a sliding logarithmic scale that changes dependant on temperature (i.e. a 20/20 wouldn't mean it's the same viscosity when cold/hot). And 0/40 doesn't mean that it has no viscosity when it's cold...
How do people come up with these things? Obviously, if it was simple, the 'little people' might understand Can't have that.

carl

Yes, the 'W' does something funny to the number in front of it (I would say 'multiplies by 10 or something' but that doesn't account for 0W). On the face of it something like 15W/50 would give the impression that it gets thicker with temperature, when in fact it just gets thinner slower.

Andrew Timmins

www.m161fhr.pwp.blueyonder.co.uk

This may help you Lee.