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[TR] Greenish oil now 50weight?

Subject: [TR] Greenish oil now 50weight?
From: sumton at sbcglobal.net (oliver)
Date: Tue, 27 Sep 2011 11:26:03 -0500
References: <2163075C495A4AF1A887C353FD425DEF@DELL05639><04dd01cc7c7d$f19fa6f0$d4def4d0$@rr.com><4F26795EE3B548D7B1D37D7F44923C55@DELL05639> <0c0f01cc7d1d$78eddd80$0301a8c0@randall>
been running 20/50 in all my old cars for years . . .  but I'm in Dallas 
where cold is occasional and not that cold

--------------------------------------------------
From: "Randall" <TR3driver at ca.rr.com>
Sent: Tuesday, September 27, 2011 8:58 AM
To: <triumphs at autox.team.net>
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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