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HK-Q-Z5.0Lfan Offline
#1 Posted : Sunday, 9 February 2020 3:40:07 PM(UTC)
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Looking for suggestions, HQ Salisbury open centre, what diff oil to use.
Car has been sitting for 20 plus years. Old oil wasn't too bad, no moisture or foreign crap in it.
Want suggestions for a couple of quick oil changes while car gets moved around getting work done. The what brand & grade to use after that

Thanks for any advice
Ian
Smitty2 Offline
#2 Posted : Sunday, 9 February 2020 6:15:43 PM(UTC)
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Penrite 80W-90 diff gear oil
is what I would use ...

https://www.penriteoil.c.../gear-oil-80w-90-mineral
Club circuit racing...the best fun you can have with your pants on
Sandaro Offline
#3 Posted : Monday, 10 February 2020 1:14:02 AM(UTC)
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Good suggestion. I use the same but castrol. Seems the old Holdens never required gearbox/diff oil changes? Yet modern cars designate say 45k for diffs/gearboxes. What sort of time frame should the old Holden be changed?
wbute Offline
#4 Posted : Monday, 10 February 2020 10:11:13 AM(UTC)
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Originally Posted by: Sandaro Go to Quoted Post
Good suggestion. I use the same but castrol. Seems the old Holdens never required gearbox/diff oil changes? Yet modern cars designate say 45k for diffs/gearboxes. What sort of time frame should the old Holden be changed?

Once every 35 years, whether it needs it or not.
HK-Q-Z5.0Lfan Offline
#5 Posted : Monday, 10 February 2020 9:07:37 PM(UTC)
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Originally Posted by: wbute Go to Quoted Post

Once every 35 years, whether it needs it or not.


Thanks James, I can get another 10 years out of my oil
wbute Offline
#6 Posted : Tuesday, 11 February 2020 7:57:23 AM(UTC)
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Sounds like you have already drained it though? You might need to filter it through a stocking before you put it back in!
The oil selectors on the couple of websites I looked at all suggested 80W/90 for non LSD Salisbury diffs.
Smitty2 Offline
#7 Posted : Wednesday, 12 February 2020 12:12:03 PM(UTC)
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Originally Posted by: wbute Go to Quoted Post
Sounds like you have already drained it though? You might need to filter it through a stocking before you put it back in!
The oil selectors on the couple of websites I looked at all suggested 80W/90 for non LSD Salisbury diffs.


and 80w-90 with lim slip additive
for those with a slippery centre

Club circuit racing...the best fun you can have with your pants on
johnperth Offline
#8 Posted : Wednesday, 12 February 2020 7:56:50 PM(UTC)
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why would you want put crappy 50 year old oil in to your car .Gear oil would cost about $10 bucks.
false economy to reuse.
HK-Q-Z5.0Lfan Offline
#9 Posted : Thursday, 13 February 2020 5:58:55 AM(UTC)
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Sorry mate, I was joking. I usually aim to change gearbox & diff oils every 12 months/20000ks or regular intervals as time permits.
castellan Offline
#10 Posted : Thursday, 13 February 2020 2:08:46 PM(UTC)
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I would say that with an open wheeler diff the oil will be fine for the life of the diff and I have seen such oil come out clean in my wife's VS Commodore open wheeler with 10 years having it from new and say 160.00KM up on it. so unless you drive through water all is ok.

Seen plenty of banjo open wheeler diffs with metal in the oil but the oil was full of metal cast iron gunk because they were worn out past the plates that the star gears sit on and then they start hacking into the soft cast iron, so I would say that contamination started at some time and grew, so I do not think that a open diff can wear out unless contamination starts it's act slowly and then builds up and up, they have no oil filter to trap contamination, so once it starts it's best to change it.
now I had an argument with one retired mechanic who just claimed you never change the diff oil ever, because it never needs such. I said BS ! you are pissing into the wind because I buy new cars every 2 years and 100.000km, with always LSD and I worked it out that by 50.000km the LSD were only partially working and they just loose their LSD capability from 10.000km on till they are just crap.

LSD diff oil has to be changed early because of metal contamination of the LSD so i would say from about 2.000km i would change it regardless, the amount of metal is amazing at that and the best thing one can do is get a proper magnet that you can buy for them and place that on the outside of the mains caps as they are steel.

The oil does not brake down so much, but it's the contamination that is the major problem.
 1 user thanked castellan for this useful post.
Smitty2 on 13/02/2020(UTC)
johnperth Offline
#11 Posted : Friday, 14 February 2020 4:35:39 PM(UTC)
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Technically the oil never wears out its been in the ground millions of years ( why old holdens are environmentally good, they return used oil to the earth as you drive along) what wears out are the additives different companies put in also the oil may get polluted by ground up metal etc.and water, . also you can buy specific lsd oil you don't need an additive.
There used to be a guy in Perth who recycled oil he store it in drums for years to let it settle and then processed it somehow. Don't know if he is still around.
HK-Q-Z5.0Lfan Offline
#12 Posted : Wednesday, 19 February 2020 9:01:15 AM(UTC)
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Thanks guys,
All good advice. I found a 4L of Castrol EPX 80/90 still sealed that would been in shed 15 or more years. I will use that for running around town while I get work done.
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