Mike,
Although 20W50 is the original recommended oil for Spitfires, I have had no
luck finding this viscosity in a decent oil at a normal motor factors.
Manufacturers like Castrol and Penrite do 'Classic' ranges of oil, but you'll
have to go to a classic specialist to get these, otherwise the only 20W50 I've
found is for 'Value' range oils, which I would not put in my mower!
I have been advised by people whose job it is to know that it is definitely
better to use a good quality oil in slightly the wrong viscosity than a poor
quality oil in the right viscosity. I use 'Castrol GTX for basic engines'
(15W40 I think) with no apparent problems. I was using GTX Magnatec for a
while, but at the rate Daffy leaks I couldn't justify the extra cost...
I would be very wary of aftermarket additives - particularly any that contain
Teflon or other flaked or solid particles in suspension. If you want to know
why, I can point you in the direction of various articles that tell you just
what's wrong with these things. At best they are harmless, at worst they will
clog up your oil galleries. Not good.
I hope you get your woes sorted out! It will get better!!
Richard & Daffy
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