JIM THEO

As far as I know Rally teams often use two different oils mixed to "produce" the desired viscosity, for example you can mix a 300V 5W/40 with 300W 20W/60 to have another final product but this is even from Motul themselves suggested for these oils!
What if I mix say a Castrol RS 10W/60 with RS 0W/40 in 50-50 ratio?
I'll have a perfect viscosity (5W/50) that is according to some oil analysis I have in my hands the best compromise regarding European climate conditions and engine wear in our turbo cars!
Or have I miss something?
JIM

JohnD

iTrader: (5)

Jim
I have done exactly what you are suggesting, but in a 75/25 mix to reduce the viscosity as I consider 10/60 too thick for winter use. I asked the question on the recent "Lubricating your subaru" thread but it was frowned upon, with the suggestion that the two RS variants may have different additive packages and the full advantages of either product may be compromised. Have to admit I had no apparent problems.
JohnD

Gidney&Knowlesy

Oil firms must spend billions between them in research & development & you go mixing 2 variants? Surely if it was any good it would be on the shelf by now.......

Bob Rawle

Supply and demand, if you do mix grades then they should be of compatable constituents, there is no reason to not do it on that basis, however you could get two grades fighting if they are not strictly compatable. Just because they are made by the same company does not imply safety.

bob

JIM THEO

Motul says there is no problem when mixed together two or more of the V300 series (except 5W/30 I think) so wonder if the above is valid for Castrol RS series, although in their site they claim 0W/40 and 10W/60 are different products, who knows?
JIM

oilman

iTrader: (9)

Personally, I wouldn't do it.

Oils are finally balanced and the VI Improvers, additive packs etc are dosed to very fine tolerances, the consequences of upsetting them are unthinkable.

Why not just buy a decent 5w-40 or 5w-50 (PAO/Ester) and leave the technical stuff to the people with the know how?

NOOOOOOOOOOOOOO

Cheers
Simon

JohnD

iTrader: (5)

Which is what I am now doing, I no longer mix (I did it once!) but can you suggest an easy to obtain PAO/ester 5/40 or even more difficult to find, a 5/50 considering your comments on various makes on a recent thread?
Jim was suggesting that 10/60 = too thick, 0/40 = too thin, so that's Castrol out of the equation! (Even Mobil 1 is getting close?) What's required, ideally, is something in between?
JohnD

MY99-5DR

How's about Motul 300V Power (5W-40), Motul 300V Chrono (10W-40), Silkolene Pro S 5W-40, or a dark horse; Volkswagen's own brand Synta Gold (5W-40) - excellent stuff.

oilman

iTrader: (9)

Yes, no problem, we have all grades.

Just email me for a price list: sales@opieoils.co.uk

Fuchs Titan Supersyn SL 5w-50 (PAO)
Fuchs Titan Supersyn SL 5w-40 (PAO)
Silkolene PRO S 5w-40 (ester/pao)

And we have more!

Cheers
Simon