HI All,
Some years ago before the "reintroduction" of "classic" straight 30/40/50 oils
It was quite difficult to obtain plain grade oils
I used to be able to get Duckhams fleetol 40 this was used in older diesel engines, then Castrol had 30 and 40 for diesels as well (RX super????)
Nowadays it seems modern diesels use very low viscosity oils and I have not seen a straight diesel lube in the British Isles for a long time!!!
dpaddock can probably still get them in the USA as I believe thyey are available there??
Nigeldtr, I dont think you are correct in your thoughts about multigrade (or we are interpreting things differently??)
Multigrade to the best of my knowledge is described like this,
It has the viscosity of the lower number (say 10,15, 20) at say 0 deg C
And the viscosity of the higher number (say 40 ,50 ) at say 100 deg C ( I dont have the actual temp figures in my head
)
It does not get thicker as the temperature rises!!
I dont claim to know how all this technology actually works
My wife has a modern Mini (BMW) which uses a 0w/40 oil, which is bloody expensive!!!!
this pours almost like water and I dont know how it works??????
I know that SRM will not guarantee their rebuilt engines UNLESS they are run on straight monograde oil
Alan, I would recommend moving the filter to the return line, as others have said
Regards To All
John O R