Howard 350 EP90 EP80W90 GL4 GL5 for info.

[rjy]

Just talked to a helpful chap at Comma. The instruction book for this rotavator says use EP90 in the gearbox. I can’t find that near me, today, so after a chat I’m going to get some EP80W90 GL4 which the Comma man thinks will be a good substitute “similar to what would have been used in the mid-70s” (he was not so sure about the GL5 version and “yellow metals” being OK, saying “it depends”).

[john-e-w]

Try Halfords or Amazon – just Googled EP90

John E-W

[enginear]

If Howards recommended gl4 then that is what you should use, which is more suitable for spur gears and the like
, gl5 id for diff’s, nothing to do with viscosity, also ep oils should never be used in gearboxes which have phosphor-bronze bushes as these will get eaten away by the ep, also gl5 has twice the amount of additives that will eat brass, copper and p/b.

[Author]

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