Seastoke
Well-Known Member
so in my hand book it says 15/40 CF 4 only cf 4 is obsolete does anyone have any thoughts
It isn't specifically marine oil.
Shell Rimula rt4X was recommended on this forum. It is a bit old fashioned which is just the job.
If you go to the smith and allen link and look a the documents tab and then technical data you will see it is CF-4 compliant , among others.
I have 20litres in my engine bay waiting to go in - this weekend i hope.
so in my hand book it says 15/40 CF 4 only cf 4 is obsolete does anyone have any thoughts