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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Diff and gearbox oil recommendationsViews : 653 Replies : 3Users Viewing This Thread : |
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Jan 12th, 2021, 12:56 | #1 |
New Member
Last Online: Jan 5th, 2022 09:31
Join Date: Jan 2021
Location: Cheshire
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Diff and gearbox oil recommendations
Hi all,
I'm reading various things about oil for the gearbox and rear axle in my PV544. Some times I read 20w50 for the gearbox, other times it's SAE 80/90. What do others use? It's a 1962 PV with a B18 engine (Zenith carb). I'm in the UK. Rear axle should be EP90, GL4, hypoid, or...? Cheers, Chris. |
Jan 23rd, 2021, 09:25 | #2 |
marches on his stomach
Last Online: Feb 11th, 2022 03:15
Join Date: Jan 2018
Location: Somewhere in the Netherlands
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My advice is to choose a brand and then use their oil advice.
Here in Holland / Benelux countries a company called Kroon Oil make a nice range of oils for classic vehicles. If I were living in the UK I'd probably be using Castrol classic oils as there they are easier to find than Kroon (whereas here Kroon is easier to find)
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1961 Volvo PV544 the quick and easy in between project(!) 1981 Mercedes 300D <=> 230 diesel to petrol conversion project 1965 Series 2a Station Wagon mega build 1992 Mercedes 190E The car that works! |
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Jan 23rd, 2021, 20:40 | #3 |
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Last Online: Jan 5th, 2022 09:31
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Location: Cheshire
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Thanks Army!
I was confused when the workshop book mentioned SAE 30 oil, but it looks like this was a misprint, because later in the book it says SAE 80, which is more like what I expected. In the end I've gone for Morris SAE 80 GL4 for the gearbox, and EP 80/90 Hypoid GL4 for the (Spicer) diff. Morris do a good range for classics. I also spotted some threads on here where someone was advising GL5 oil - in my experience with older Citroens, this is the wrong advice, because GL5 attacks bronze and sintered bushes. GL4 is the only safe formulation for older gearboxes. All sorted now anyway |
Jan 23rd, 2021, 21:14 | #4 |
Master Member
Last Online: Apr 27th, 2024 15:46
Join Date: Jul 2020
Location: Saskatchewan, Canada
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Your choices should work just fine.
Some of the confusion maybe related to the type of oil. If referring to SAE 30 the service manual likely meant 'motor oil'. When referring to SAE 80 it definitely would have been 'gear oil'. For the M40, Volvo specifies SAE 80 or SAE 90 gear oil (above 30 C) or SAE 30 motor oil. SAE 30 motor oil and SAE 80 gear oil are very similar in viscosity at 20 C. The Volvo recommendation for non limited slip differentials would be SAE 80 gear oil. You are semi correct about the GL-4 vs GL-5 designation. A lot of GL-5 oils use sulphur based additives which are not brass friendly. However, not all GL-5 oils use sulphur based additives. Also, modern transmissions typically use brass synchronizing rings so it is not just 'older gearboxes' that you have to be concerned about. |
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