Isuzu MSA Gearbox Oils and Gear shifts

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Originally Posted by isuzurover

I found syntrans even better than vmx80. However I takes 1000 k's or so to fully bed in when you first switch to it.

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Originally Posted by bee utey

Probably worth putting a cheap load of engine oil through it for a week or 2 to flush it.

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The new oil needs to displace the old friction modifiers from the clutch faces and embed the new ones, can take 700-1000km.

If a 15w-40 engine oil is specced, any decent 75w-90 MTF will work.
Replaced the g/box oil in my gf's Courier a few weeks back with Syntrax and the cold shifts were immediately better, hot marginally.

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Originally Posted by rick130

The new oil needs to displace the old friction modifiers from the clutch faces and embed the new ones, can take 700-1000km.

If a 15w-40 engine oil is specced, any decent 75w-90 MTF will work.
Replaced the g/box oil in my gf's Courier a few weeks back with Syntrax and the cold shifts were immediately better, hot marginally.

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My ~1986 MSA-5P sticker says 15w40.
My ~1992 MSA-5G sticker says 5w30.

*edit*
I run VMX80 in the MSA-5G with good results on Rick's suggestion, it's a good match for the 5w30 viscosity wise. I didn't experiment with oils in the 5P.

Well there is my problem dougal, I ran a gearbox oil in it. Will drain it tomorrow and put some good oil in it😊

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Originally Posted by rick130

The new oil needs to displace the old friction modifiers from the clutch faces and embed the new ones, can take 700-1000km.

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Quite possibly, but I have different experiences. E.g. A bloke that drove his Cruiser from Perth to Adelaide came to me with shockingly poor shifts in a reco box. I drained and refilled it with engine oil and the shifts were loads better within the first 2km. Undoubtedly it could further improve but the change was immediately noticeable.

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Originally Posted by bee utey

Quite possibly, but I have different experiences. E.g. A bloke that drove his Cruiser from Perth to Adelaide came to me with shockingly poor shifts in a reco box. I drained and refilled it with engine oil and the shifts were loads better within the first 2km. Undoubtedly it could further improve but the change was immediately noticeable.

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Yep, it can be that fast too, experienced that myself, but it can also take a few km, just depends on the oil, fm's used, synchro surfaces, etc.

No hard and fast rules.

I think I'm running an 80-90w oil:(

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Originally Posted by Vern

I think I'm running an 80-90w oil:(

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Well that would explain it!!! Lucky the isuzu boxes aren't as fragile as landy boxes...

So best value for money oil to run would be?

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Originally Posted by Vern

So best value for money oil to run would be?

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Best value you say?

Try this Gulf Western Top Dog XDO Engine Oil - 20 Litre, 15W-40 - Supercheap Auto

On special you should be able to get it for under a hundred?

I'd throw some engine oil in it for starters to flush the other stuff out. Run it like that until you do your next engine oil change.
That way if there's a leak (being an unknown box) you're not throwing out good stuff when you sort the leak out.

Steve