Topic

I'm sorry is this sounds a more than obvious question but do the Fs and TFs run better on the old oils, or the newer synthetics and what do most people use and why please?

Semi synthetic 10 w 40 is the recommended engine oil .

Forgive me but what is semi synthetic oil please buddy?

I am by no means an authority on this subject, but here goes. There are ' straight ' engine oils , which is refined crude oil , fully synthetic oil ,which is entirely developed from blending chemicals and is quite expensive but has excellent lubrication properties and semi synthetic oil which is a blend of 'straight' oil and synthetic.
The K-series engine in the F nTF is fine on 10w/40 semi synthetic. Some on this forum go for fully synthetic oil but I feel it is a tad expensive but as I say its excellent oil .
John

I use Castrol Magnatec in my 1996 F mpi (multi point injection) 10w40 semi synthetic and have always done

I use fully synthetic oil (5w40 or 10W40 whichever is available) in both of our Fs. I use synthetic oil because I figure the oil is cheaper than engine work. If I wait to buy the oil on sale, there isn't much difference in cost.

same, 10W40 semi. On sale at Aldi or Lidl from time to time, I always grab some cans.

Brilliant explanation to a novice, thanks I understand that now.