Max,
The composition of the oil is dependent on the weight. The
specifications allow more zinc and phosphorus in the heavier oils.
That's why you can get SG rated oil with plenty of Zinc and
Phosphorus.
I suspect the most important parameter when buying oil for your MG is
to ensure is is 20W/50. As you are in the Bay Area, I suspect you can
buy Amsoil 20W/50, which is SG rated, but marketed as having high Zinc
and especially suitable for flat tappet engines.
Simon
On Mon, Jun 17, 2019 at 4:28 PM Max Heim via Mgs <mgs@autox.team.net> wrote:
>
> Yeah, I used it for years. But then back around the early 2000s I had to
> replace the cam. All the lobes were scored, and the lifters spalled. Thatâ??s
> when I started hearing about zinc and the absence of same. Somewhere between
> being rated â??SGâ?? and â??SMâ?? all the zinc went away. It took me a while
> to find a good high zinc oil that was locally available.
>
> I replaced the lifters again last fall, as a precaution, since I had the head
> off anyway. One was just starting to show spots.
>
> --
> Max Heim
> '66 MGB
>
> On Jun 17, 2019, at 3:33 PM, Richard Lindsay via Mgs <mgs@autox.team.net>
> wrote:
>
> I guess I'm just an old school fool, but I don't drive my LBCs much. I use
> Castrol GTX 20W50 in my TR6, TD and E-Type.
>
> On Mon, Jun 17, 2019, 4:19 PM dave via Mgs <mgs@autox.team.net> wrote:
>>
>> Iâ??ve been using Valvoline 20w 50 full synthetic for several years now, and
>> it used to be immediately available from Amazon with free shipping. It has
>> zddp.
>>
>>
>
>
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