Joined: Mar 2015 Posts: 5,442 Threads: 231
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Location: Scotchland
I agree - this is perfectly okay to use.
Joined: Aug 2017 Posts: 861 Threads: 74
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Thank you both, that's great. I have enough to last me a lifetime!
Peter.
Joined: May 2018 Posts: 2,954 Threads: 558
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Location: Peak District, Derbyshire
Car type: 1929 Chummy, 1930 Chummy, 1930 Ulster Replica, 1934 Ruby
18-04-2020, 06:46 PM
(This post was last modified: 19-04-2020, 12:59 PM by Tony Griffiths.)
Note the API rating of GL4, this means that the sulphur added to improve performance is inactive and will not attack bronze bearings. Oil with an API rating of GL5 also had inactive sulphur.
In an EP oil does not have GL4 or GL5 rating it will attach bronze bearings over time.
Joined: Aug 2017 Posts: 2,748 Threads: 31
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Location: Auckland, NZ
Most sources claim that even modern GL5 will not attack brass and bronze, at least not at temps likely to be reached in a Seven diff. .However the occasional seemingly authoratative source still casts doubt on GL5, but GL4 OK..
Publication 843/C by the Austin Motor Co but dated 1957 so presumably a reprint gives data for all Austin 1936/39 models. EP 140 for diffs. (I have noticed these oils used to settle markedly. As garages dispensed from 40 gal drums I dont know what late users received.)
