API SF SG SH OIL DOES IT MATTER

[jackassdave]

looking for some oil ,(mineral) for the old gs ,checked the manual, it says sg.sf/sh in a 20/50 ,but all the ones ive looked at are sc, last airhead i had .,i just put duckhams, but as some one on this section said ,its crap ,just thouht i would try something else, just cant find any in the grade they recommend, to be honest ,i never bothered last time,
doe the SF/SG/SH grade make any difference, i change it more than they recommend anyway.
havent looked at morris oils yet though
i know its all been done before but if any one has a one line answer, for oils

 

[John Armstrong]

One liner, don't mix extra virgin with semi synthetic oils

 

[B Murr]

Duckhams seems fine ansd was reccomended to me by an airhead mechanic. I'm using castrol 75.90 for the gearbox and pinion though. I did think of using additives but wisdom on this site was not to waste the money.

 

[jackassdave]

not even for a salad dressing

 

[(RIP) Proff]

Silkolene, Morris's and Castrol all do 20/50 mineral
some bloke on ebay sells it by the gallon tin ///
I'll find the number tomorrow...

Duckhams was and is shit, thats why duckhams is no more

 

[Kenny]

SE is fine for airheads ( unless you read the Haynes manual )... B & Q sell mineral oil 20/50 at £9.99....and if Thunder got to The Gambia and back on it, then it has been well road tested