20W/50 hasn't been generally available in the UK for years. First Castrol
changed their GTX to 15W/50 which was an improvement, then to 15W/40 which
wasn't, and most oils for 'older' i.e. non-injection engines are 15W/40.
Valvoline 20W/50 is still available from specialists, but I don't trust it.
I had short measure in one container, my V8 seemed to make more noise when I
was using it, and the containers are the same as used by the really cheap
reclaimed oils anyway. Halfords sell their own 20W/50 (made by Comma) in
the old-fashioned metal one gallon cans, but there is no tamper-proof seal
i.e. anyone could remove the cap at any time and put anything in it. But
surely, 5W/50 is way better than any of the above? The 5W means that it
will flow better i.e. get round the engine sooner in cold weather, but it
will still have the protection of a 50 when hot.
PaulH.
----- Original Message -----
> .... Unfortunately Castrol's
> solution is that 5W 50 is the best replacement. Well, it's not. A cold
> temp
> 5 wt
> oil is too thin for my cars, and probably several of yours.
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