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Differential Oil

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Posts: 143
Joined: Sat Jul 09, 2016 7:29 pm
Location: New Forest Fordingbridge

Differential Oil

Post by sp250boy » Sun Mar 10, 2019 3:12 pm

Sorry for not being a more interesting post..

What is the oil I should use for the differential, on my 1939 Lanchester La11

Many thanks
It is a Lanchester

Norfolk Lad
Posts: 554
Joined: Wed Feb 10, 2016 8:23 pm

Re: Differential Oil

Post by Norfolk Lad » Sun Mar 10, 2019 5:06 pm

The oil is shown here as SAE140 viewtopic.php?f=5&t=3994&p=22951&hilit=LA10+oil#p22951
it has to be this type not what you buy as your normal gear oil hypo attacks the bronze causing wear .

Posts: 143
Joined: Sat Jul 09, 2016 7:29 pm
Location: New Forest Fordingbridge

Re: Differential Oil

Post by sp250boy » Sun Mar 10, 2019 5:23 pm

Thanks NL,
Just looking on ebay for SAE 140 and spotted this: ... xyBC1SCLmg

I like to support the little guys, so whats the opinion of this oil?

Thanks in advance
It is a Lanchester

Posts: 435
Joined: Wed Sep 05, 2018 9:55 am
Location: Ridgewood - East Sussex

Re: Differential Oil

Post by classiclife » Sun Mar 10, 2019 5:48 pm

GL4 type diff oil is fine, but GL5 will attack bronze and seals.

If your transmission is NON-HYPOID then you need a GL1 spec oil; Penrite Transoil 90 is a good example of GL1 as is Millers Vintage Green Gear Oil 140.

Depends on which viscosity you want to go for. Most owners with a noisy or a slightly worn diff tend to go 140.

I know Pennine Oils and have to say there is better out there - just my opinion and experience.


1968 Daimler V8-250 Saloon
DLOC East Sussex Area Representative.

Southern Classics Society Events Co-ordinator.

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Re: Differential Oil

Post by JT7196 » Sun Mar 10, 2019 8:44 pm

Hi, I’ve actually got a mixture of SAE 140 & SAE 250 in my rear Axle, it just helpes reduce noise on the overrun .

Cheers Al 😊😊

Ps, Actually SAE 140 is specified as standard fro the Rear Axle on LA10
11 etc, etc 😊😊

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