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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Differential oil / fluid

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Old Sep 3rd, 2017, 16:44   #1
wowoguy
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Default Differential oil / fluid

I'm working on the theory that there are no stupid questions here.

As part of routine maintenance I'll be replacing the differential cover gasket on my 1968 Amazon 131. Which oil / fluid should I use to refill it? It has overdrive; does this make any difference?

Brookhouse states SPICER DIFF COVER GASKET. FITS ALL AMAZON & P1800 MODELS, but they have a foot note which advises (YOU MUST CHECK WHICH MAKE OF AXLE YOU HAVE FITTED). Is this a contradiction if it fits ALL Amazons?

Thanks.
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Old Sep 4th, 2017, 09:57   #2
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I would recommend a high pressure gear oil in the rear axle, GL-5 (Hypoid) and I would be more concerned about the pressure rating (GL rating) rather than the viscosity.

GL rating is based on how much pressure is exerted between the gear teeth as the gears are under load.

With reference to viscosity, 80 was recommended, but I don't know whether multi-grade gear oils were available back then. I like the idea of 80/90 for good viscosity in a range of temperatures.

There were different gaskets available so I would speak to the people at Brookhouse to makes sure you're getting the correct one.

PS: You're right! There are no stupid questions on this forum!
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Old Sep 4th, 2017, 18:01   #3
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Quote:
Originally Posted by wowoguy View Post
I'm working on the theory that there are no stupid questions here.

As part of routine maintenance I'll be replacing the differential cover gasket on my 1968 Amazon 131. Which oil / fluid should I use to refill it? It has overdrive; does this make any difference?

Brookhouse states SPICER DIFF COVER GASKET. FITS ALL AMAZON & P1800 MODELS, but they have a foot note which advises (YOU MUST CHECK WHICH MAKE OF AXLE YOU HAVE FITTED). Is this a contradiction if it fits ALL Amazons?

Thanks.
EP90 Hypoid gear oil is stipulated. Orpie Oils doing a reasonable deal here. I have just changed my diff and used this oil. Also replaced the Spicer Diff cover gasket from Brookhouse. Speak to Simon who will advise. Excellent service once again from Simon.
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Old Sep 6th, 2017, 14:39   #4
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I've used the Castrol EP90
Available here and elsewhere
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Old Sep 6th, 2017, 17:01   #5
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Quote:
Originally Posted by wowoguy View Post
I'm working on the theory that there are no stupid questions here.

As part of routine maintenance I'll be replacing the differential cover gasket on my 1968 Amazon 131. Which oil / fluid should I use to refill it? It has overdrive; does this make any difference?

Brookhouse states SPICER DIFF COVER GASKET. FITS ALL AMAZON & P1800 MODELS, but they have a foot note which advises (YOU MUST CHECK WHICH MAKE OF AXLE YOU HAVE FITTED). Is this a contradiction if it fits ALL Amazons?

Thanks.
I would use the current volvo hypid axle oil from the dealer or castrol Syntrax 75w/90 which is excellent being synthetic and will last for a long long time and reduce frictional losses in the axle .compared to EP90.

http://www.ebay.co.uk/itm/Castrol-Sy...4AAOxyBotTbNYa
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Old Sep 6th, 2017, 22:01   #6
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Quote:
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I've used the Castrol EP90
Available here and elsewhere
I hope you don't mind me saying, but that's only GL-4 (moderate pressure hypoid gearboxes) and I would recommend something suitable for the very high pressures exerted on the gears in the old diff back there, GL-5.

As above, the the multigrades that are around nowadays for high pressure gear oils mean a better temperature range when only single grades were around.
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Old Sep 8th, 2017, 13:23   #7
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The 68 will be a spicer but older models could be spicer or ENV hence saying to check. Very simple visual check spicer is a rear loaded diff and ENV is front loaded
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Old Sep 11th, 2017, 13:34   #8
wowoguy
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Thumbs up Differential Oil

Thanks very much classicswede, swedishandgerman, Clan, jpws and Dibble.

I appreciate your time, expertise and thoughts; all useful. Since posting this question I was fortunate enough to spend some of yesterday with Simon from Brookhouse at the Sywell meet with my car parked beside his. He explained the differential gasket will fit my car and that the high pressure between the cogs when under load must be taken into account and that modern lubricants are better than the originals.

You guys have extended the conversation, providing more detail, so I now know what I am looking for. Simon said if I can't get it locally he has it.

I will ignore the previous local advice that the "Halfords Classic 20 W 50 engine oil would be OK!" (No, I didn't get that advice from Halfords. They were professionally cautious).

Thanks a million.
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Old Sep 18th, 2017, 21:53   #9
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Default Volvo 123gt 1967

Hi. I have been asking the same question but with regard to all lubricants.

The car has done 106,000 miles and we were seeking advice on the grades of lubricants to use.

The engine is B18B and the car manual recommends SAE 10W-30 oil, however given the age and mileage of the car we thought this might be a little thin. Liqui Moly recommends SAE 20W-50HD. We are based in Scotland so temperatures vary from probably -15°C to +30°C.

The transmission is an M41 and again the car manual recommends SAE 20W-40. However Liqui Moly recommends SAE 20W-50HD, the same as the engine oil, or Touring High Tech HD30.

Finally the rear axle with slip differential. This has a bit of a rumble on it and the car manual recommends American military standard MIL-L-2105 or MIL-L-2105 B. Liqui Moly recommends Hypoid Gear Oil.

Any guidance or advice you could give on these three lubricants would be very much appreciated.

Thanks
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Old Sep 19th, 2017, 13:01   #10
Derek UK
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IF your 123GT has an LSD it will need the correct oil for one of these. UK supplied GT's were not routinely supplied with an LSD but had to be specified when you ordered. In Canada (cars built over there) and Sweden it was more of a delete option so a bigger proportion of them have it. Be certain that you have it before making your oil choice. Standard diff needs EP90 or a synthetic equivalent.
To check axle for LSD put axle on stands, both wheels off the ground, and turn one wheel by hand in the forward direction. If the other wheel turns in the same direction as the one you are turning you have an LSD. If it urns in the opposite direction you have a standard diff. I only added this because it one of the myths, like all GT's have 4.5" wheels that all GT's have an LSD.
A good quality 20-50 is fine for engine and gearbox/overdrive. Check that the zinc levels are over 1000ppm, 1200 better. This is to protect the cam and followers.
I will not endorse Liqui-Moly but you may have just got the info from their website. Under no circumstances should you use slippery additives like moly in an overdrive gearbox as it will cause the clutches to slip. Liqui Moly shouldn't be recommending that for this application.
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