Back in the day, Duckham's 20/50 was the recommended multi-grade for most
British cars. I don't know if Duckham's exists any more - Johnmac?
Mike
----- Original Message -----
From: "Randall" <TR3driver at ca.rr.com>
To: <triumphs at autox.team.net>
Sent: Tuesday, September 27, 2011 8:58 AM
Subject: Re: [TR] Greenish oil now 50weight?
>> what does the list think of running Valvoline 50 weight oil?
>
> Straight 50 weight is too thick when it's cold, IMO, particularly with a
> freshly rebuilt motor. Back when I lived in a cooler climate, I found
> that
> the oil pressure would go too high (peg the gauge) even with 40 weight.
> Pressure too high puts extra strain on the pump drive, and makes leaks
> around the filter head more likely. It's also apt to open the bypass
> valve,
> and feed the engine with unfiltered oil.
>
> But 20W50 (which acts like 20 weight when it is cold) might be OK.
>
> -- Randall
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