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What gear oil do I add at pm for a cm870. Thank you
80 90 gl 5 is what I use. Probably shouldn’t use gl5 but that’s what Walmart has. I think new gl 5 doesn’t eat brass.
Sta-Lube SL24239 API/GL-4 Multi-Purpose Hypoid Gear Oil - 1 gal https://www.amazon.com/dp/B000M8RYMC?ref=yo_pop_ma_swf

This is what I use in my CM870 a gallon every 10 thousand miles.
(03-03-2018 )MBlazevic Wrote: [ -> ]Sta-Lube SL24239 API/GL-4 Multi-Purpose Hypoid Gear Oil - 1 gal https://www.amazon.com/dp/B000M8RYMC?ref=yo_pop_ma_swf

This is what I use in my CM870 a gallon every 10 thousand miles.

this is also what I use.
I used the walmart 80 90 gl5 for last couple hundred k miles, I need to check with mr.hagg on how the engine internals look he is doing the inframe now
I’ve been kinda wondering on this gl 5. Feed back would be cool.
Magard look inder Rawze technical documents.
Why I add 12% (one gallon) of gear lube at every oil change...

Read on brother, it'll have more than enough info for you to make an informed decision.
I’m running a gallon of gear oil. It’s gl 5 because it hard to find gl 4. I’m wondering what the friction modifiers do in the oil. There made to not be too slippery for the limited slip clutches in a reared.
OK, dumb question... Supertech GL5 at Walmart for $13 a gal or the Sta-lube GL4 at Amazon for $39.

Is the GL4 that much better?
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