[Mgs] Oil viscosity for 3.5 V8 engine

Dan DiBiase dan.dibiase at gmail.com
Mon Oct 10 06:00:44 MDT 2022

Rick, you need to add this one to your collection! Looks like it's in great
shape and inexpensive....


Dan D
Central NJ USA

On Sat, Oct 8, 2022 at 8:38 AM Richard Lindsay <richardolindsay at gmail.com>

>    All good words Max. Thanks. I didn't know about the 15W50 Mobile 1 zinc
> thing.
>    Where I live it never really gets cold, so a constant viscosity oil
> would even work. That said, I don't drive my cars enough to worry about
> wear. I just play with them. My go-to oil for everything older is Castrol
> GTX 20W50.
>    I guess I should define 'everything older'. Specifically, I mean my '53
> TD, '71 Volvo 1800E, '72 MGB, '73 E-Type (V12), and even my 25-year-old
> über-high mileage Nissan D21 pickup. Everything else/newer gets whatever
> the Owner's Manual recommends.
> Rick, in Houston
> PS: Classic Plymouths are awesome.
> On Sat, Oct 8, 2022, 2:13 AM Max Heim <mvheim at sonic.net> wrote:
>> I am using 15W50 in all my cars at this point: 1966 MGB, 1967 Plymouth
>> slant six, 1967 Plymouth 4bbl V8; specifically, Mobil1 15W50 which is
>> formulated for flat tappet engines and has 1500ppm zinc. Note that other
>> weights of this brand are NOT appropriate for older cars.
>> 50 is not too high viscosity for summer use in California (it’s really
>> what you want), and 15W indicates that is not too heavy for winter use.
>> --
>> Max Heim
>> '66 MGB
>> On Oct 7, 2022, at 8:02 AM, <jimray at hartcom.net> <jimray at hartcom.net>
>> wrote:
>> I am puzzled about the proper oil viscosity for my Rover 3.5 V8 engine.
>> Des Hammill's book *How to Power Tune RV8 Engines *states “Anyone used
>> to oil pressures hovering around 70 – 75 psi on an MGB 1800 engine will be
>> alarmed to see pressures in the Rover V8 reading 15 – 40 psi. These engines
>> are low-pressure engines with normal pressures (hot) at 20 psi idle using a
>> 15W 50 oil, and 40 psi over about 3500 rpm.”  Its time for me to change the
>> oil in mine and 15W 50 seems a bit high when compared to oil normally used
>> in my other US built cars. Anyone have any thoughts or suggestions to this?
>> Thanks in advance for your input.
>> Jim Ray
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