Ben Hutchings Posted June 25, 2008 Share Posted June 25, 2008 Well.. following on from Roy's 'Gearbox Oil?' thread, what do you lot suggest as a good diff oil? I droped into a local motorfactors earlier and was suprised that they had only one GL4 oil on the shelf: Castrol SMX "Part synthetic manual transmission fluid" rated GL4, SAE 80W-90.Then I went into Halfords just around the corner and found: Castrol 'Manual' EP 80W.Which, if either, do you think would be best for the diff?Cheers! (i hope to fill the diff tomorrow evening while its up on axlestands, so any ideas before then appreciated!) Link to comment Share on other sites More sharing options...
Slimboyfat Posted June 26, 2008 Share Posted June 26, 2008 I would go for the part synthetic multi grade. Link to comment Share on other sites More sharing options...
Royboy66 Posted June 26, 2008 Share Posted June 26, 2008 I put GL4 EP80/90 in! that 'll be fine till you find sum sooperdooper stuff!! ;)stop faffing and get it back together!! :Pless than 2 weeks mate!! I know how you like to be still tinkering at 10pm the night before you go!! lol 8) Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 26, 2008 Share Posted June 26, 2008 EP80 is a lot thinner than 90 in viscosity terms most on the market now seem to be the 80/90 multigrade ... stick to GL4 and use it if you spot some straightEP 90 it would be best suited to the diff and 80 for the gearbox . bit crude but you can drill a 4mm hole in a jar lid fill with oil and time how long it takes to drain you will soon see the differences between 80 and 90 and 20/50 or whatever Peter Link to comment Share on other sites More sharing options...
Nick Jones Posted June 26, 2008 Share Posted June 26, 2008 Just make sure it has "EP" (extreme pressure) or "Hypoid" on it so that it give the ncessary protection to crown wheel and pinion.Nick Link to comment Share on other sites More sharing options...
Ben Hutchings Posted June 26, 2008 Author Share Posted June 26, 2008 Ok thanks peoples... this job keeps getting postponed! it SHOULD be tomorrow evening now.Roy: I nearly did the rocker clearances at the weekend and then thought "no... noooo way!" after what happened last time! It's now about 6 days and 20 hours until we leave! argh! Link to comment Share on other sites More sharing options...
Tom2000 Posted June 27, 2008 Share Posted June 27, 2008 Have i got this right:Gearbox: GL40 EP80Diff: GL40 EP90? Just about to do my spitfire.. Link to comment Share on other sites More sharing options...
Deleted User Posted June 27, 2008 Share Posted June 27, 2008 Tom2000 wrote:Have i got this right:Gearbox: GL40 EP80Diff: GL40 EP90? Just about to do my spitfire..GL40, no such specification, it's GL4.Gearbox, GL4 EP90 - but EP80W/90 or EP80 will be OKDiff, GL4 EP90 - but EP80W/90 if you cant get EP90. EP80 is too thin.Avoid GL5 in the Diff - unless the manufacturer of the specific oil in question says that it is yellow metal compatible and OK to use in a Diff that contains yellow metals.GL5 of any formulation may be OK in the gearbox - the problem of yellow metal corrosion is related to the temperature/pressure of the oil, and the oil in the gearbox shouldn't get hot enough to damage the yellow metals, although it will stain them. Link to comment Share on other sites More sharing options...
Tom2000 Posted June 27, 2008 Share Posted June 27, 2008 GL4 is what i meant, i brought some: Comma EP80W-90 Gear Oil (1litre) yesterday, should I just get Comma EP90 Gear Oil? and use it for both diff & gearbox? Link to comment Share on other sites More sharing options...
Deleted User Posted June 27, 2008 Share Posted June 27, 2008 Straight GL4 EP90 is difficult to find.The TSSC sell it in 1 litre bottles - I believe they get it direct from Castrol - it's not listed on the website, give Garth a bell on 01858 434424. Link to comment Share on other sites More sharing options...
Tom2000 Posted June 27, 2008 Share Posted June 27, 2008 Well my local Wilco motorists store sells Comma EP90 in 1litre bottles, should i just get this?And can u please confirm I should be using EP90 for the diff and what for my gearbox (ideally)? Link to comment Share on other sites More sharing options...
Deleted User Posted June 27, 2008 Share Posted June 27, 2008 Make sure that the Comma oil is GL4 spec.HOW MANY TIMES DO WE HAVE TO TELL YOUGearbox, GL4 EP90 (IDEALLY) - but EP80W/90 or EP80 will be OK (IF YOU CANT GET EP90) Link to comment Share on other sites More sharing options...
James Posted June 27, 2008 Share Posted June 27, 2008 I think I bought my last lot of gear oil from Halfords - that was Castrol GL4Hardly difficult to find... Link to comment Share on other sites More sharing options...
thescrapman Posted June 27, 2008 Share Posted June 27, 2008 Tom2000 wrote:Well my local Wilco motorists store sells Comma EP90 in 1litre bottles, should i just get this?And can u please confirm I should be using EP90 for the diff and what for my gearbox (ideally)?Wilco alos do it in 5 litre bottles, much cheaper. There is a premium added to the 1 litre bottles. Quite a large one.I thik the EP90 is GL5. go for the EP80/90. It is teh GL4 one.CheersColin Link to comment Share on other sites More sharing options...
Tom2000 Posted June 27, 2008 Share Posted June 27, 2008 ok so EP80/90 for diff & gearbox Link to comment Share on other sites More sharing options...
rotoflex Posted June 27, 2008 Share Posted June 27, 2008 Link to comment Share on other sites More sharing options...
Royboy66 Posted June 27, 2008 Share Posted June 27, 2008 yes Tom, that will be fine ;)Have fun! I love the smell of gear oil in the morning!! and the next morning, and the next!! :) Link to comment Share on other sites More sharing options...
Tom2000 Posted June 27, 2008 Share Posted June 27, 2008 so EP80/90 for gearbox & diff yeh? you sure?.. like really certain..? Link to comment Share on other sites More sharing options...
Ben Hutchings Posted June 27, 2008 Author Share Posted June 27, 2008 haha... Link to comment Share on other sites More sharing options...
Doug Paterson Posted June 27, 2008 Share Posted June 27, 2008 Tom2000 wrote:so EP80/90 for gearbox & diff yeh? you sure?.. like really certain..?Aye ...... but don't forget - it should be GL4 ..... not GL5. Link to comment Share on other sites More sharing options...
Tom2000 Posted June 28, 2008 Share Posted June 28, 2008 your sure? ::) Link to comment Share on other sites More sharing options...
Doug Paterson Posted June 28, 2008 Share Posted June 28, 2008 Tom2000 wrote:your sure? ::)yes - stay away from GL5 and you avoid any doubt. Link to comment Share on other sites More sharing options...
Tom2000 Posted June 28, 2008 Share Posted June 28, 2008 really? Link to comment Share on other sites More sharing options...
Ben Hutchings Posted June 28, 2008 Author Share Posted June 28, 2008 Wearing thin... but still ever-so-slightly amusing tom. To be honest I think that was the last time you could make that joke and retain some comic dignity. Link to comment Share on other sites More sharing options...
Royboy66 Posted June 28, 2008 Share Posted June 28, 2008 Hutch's right! ;)But if you want to know how to adjust the Tappets?? then He's your Man!! ::) Link to comment Share on other sites More sharing options...
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