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I have a Belle MiniMix 150 110V Electric Cement Mixer the documentation says to use a EP90 oil in the gear box, but these days it seems that most outlets only sells EP80/90 oil.

What is the difference and does it matter?

(I am asking on a mechanics.stackexchange as I need advice for people that understand gear boxes and oils.)

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asked and answered answered on – mac Feb 6 '14 at 19:40
up vote 3 down vote accepted

80W90 is a multiviscosity version of the single-viscosity 90 gear oil; it's the same concept as 10W30 motor oil being the multiviscosity version of single-viscosity 30-weight motor oil. The "W" is a "winter" rating, meaning that the oil in question is designed to be usable in winter months in cold climates.

80W90 oil is perfectly satisfactory for your purposes in a cement mixer - it can be either GL4 (with very little molybdenum disulfide) or GL5 (with lots of moly-d)... for a cement mixer I'd recommend using the GL5 because you have no brass synchro components for the moly-d to attack. GL4 is for older manual transmissions that can't tolerate moly-d because they contain brass. For gearboxes that can use it, moly-d adds extra protection against wear, especially in cases where regular maintenance is unlikely.

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much like motor vehicles (depending on age) some makers recommend mineral based oils some synthetic.They do this for a reason as viscosity/additives vary.Use what they specify.Lubricant makers have websites,some of whom allow you to pose questions regarding lubricants and applications

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