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Nov 30, 2012 21:40:16 GMT
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Do any of these gearbox oil additives actually do any good? Any first-hand experience of any particular brands? Or is there a decent gear oil which will ease the situation? The manual gearbox in my Patrol is difficult when cold, being particularly hard to select 2nd - it'll graunch and go in, or just not even select at all. It's fine when warmed up, but now winter's here I've been having to either block-shift from 1st to 3rd, or double clutch into 2nd for the first few gearshifts. I don't believe there's a fault with the gearbox - they're quite known for cold gear baulking - and there's only 90k on the clock so I doubt there's excessive wear. I'm sure syncro wear probably isn't helping, but still. I'm going to change the oil to see if it helps, but I'm not sure whether to stick something like regular GL-4 spec 75w90 in, a more fancy synthetic oil, or regular stuff and an additive. Any ideas?  |
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Last Edit: Nov 30, 2012 21:42:15 GMT by BenzBoy
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froggy
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Posts: 1,099
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Nov 30, 2012 21:44:06 GMT
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Drain a litre out and top up with ATF
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Nov 30, 2012 21:46:20 GMT
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Drain a litre out and top up with ATF That seems a nice simple, cheap solution! I take it that the ATF thins the gear oil? |
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RetroMat
Posted a lot
Column Shifting!
Posts: 3,442
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Nov 30, 2012 21:54:09 GMT
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i'd suspect just changing the gearoil for the recomended grade will made a huge difference! Gearbox oil (and diff) always seems to get forgotten come service time.
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Last Edit: Nov 30, 2012 21:55:04 GMT by RetroMat
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Bolf
Part of things
Posts: 507 
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Nov 30, 2012 22:29:01 GMT
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Using Royal purple in mine , lush!!!!
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froggy
Posted a lot
Posts: 1,099
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Nov 30, 2012 22:40:37 GMT
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done this many times and always makes a difference .
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Synthetic gear oil works wonders
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Thanks for the replies / advice. I've read on Aussie forums that Redline MT-90 synthetic gear oil works well, so I think I'll give that a whirl. It's a bit pricey but will hopefully solve it, or at least ease it a bit.
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Another vote for MT90 hear. Use it in Triumph saloon box and Supra 5 speed - improved the change on both. Try Opie oils - more reasonable than some places!
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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yeah the redline oils are good , or any quality fully syn gear oil of the correct spec
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91 golf g60, 89 golf 16v , 88 polo breadvan
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if your gearbox takes 75w90, stick 10w40 engine oil in!
Its the same range, but should be much thinner when cold.
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ClassicResto.co.uk - Restoration and maintenance of classic cars - Wolverhampton.
2002 Mercedes E320CDI Estate
1998 Mercedes C240 Sport
1995 Mercedes SL500
1993 Mercedes 500 SEL
1993 Mercedes 500SL - Sold October 2022
1989 Mercedes 300 CE
1985 Mercedes 500 SEC
1985 Porsche 911 Carrera - Sold March 2022
1983 Porshe 944
1978 BMW 1602
1973 Mercedes 350SL
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If you want something a bit cheaper, try the Total BV 75w-80, it's about £12 for a couple of litres.
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Ryannn
Posted a lot
Posts: 2,421
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My volvo used to jam in the cold, I changed the oil for the same recommended stuff and it cured!
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bl1300
Posted a lot
Posts: 1,678
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Just renewing the oil may improve things substantially.
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Current fleet.
1967 DAF 44
1974 VW Beetle 1303s
1975 Triumph Spitfire MkIV
1988 VW LT45 Beavertail
1998 Volvo V70 2.5
1959 Fordson Dexta
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Dec 28, 2012 22:16:55 GMT
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I hate coming across tech questions that have no conclusion on the internet, so I thought I'd update this one.
I changed the gear oil for Castrol Syntrans 75w90 fully synthetic today and it's made a real difference. The oil that came out was very clean so I reckon it wasn't that old - evidently the baulking wasn't due to tired oil.
The shifts from cold are much better - no double clutching into 2nd now. I'll not get too carried away, as I've yet to try it in sub-zero temperatures but it's definitely improved things.
While I was under there, I did however find a leak from my transfer case... these old cars keep busy don't they?!
Thanks for the replies, fellas.
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