Red Line synthetic MTL 70W - 80 is GL-4, their 75W - 90 Hypoid gear oil for
differentials is GL-5. I use both in my E46 BMW and I actually noticed a
difference in the smoothness of shifting compared to the "lifetime" OEM
synthetic. I have them in the roadster too, it hasn't run since the oil was
changed, but no noticeable dripping at least while stationary.
Jerry Krakauer
SRL311 00099
----- Original Message -----
From: "Pete Peters" <ppeters914@comcast.net>
To: "Datsun Roadster List" <datsun-roadsters@autox.team.net>
Sent: Thursday, July 08, 2010 5:35 PM
Subject: Re: [Roadsters] Transmission oil options for U20
> Dunno what's available north of the border, but I found GL-4 at Napa.
> Forget
> if it was Napa-brand or Sta-Lube. IIRC, someone contacted Valvoline, and
> they said their GL-4/GL-5 gear oil won't hurt our older transmissions.
>
> As for synthetic, folks report being happy with Redline MTL and Amsoil.
> May
> or may not work for you depending on the age of your seals.
>
> Pete
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