cheaper gearbox oil or redline mt90?

[tonym]

ive seen everywhere redline is the one to use but is there a cheaper alternative thats good too

i put my foot down from time to time but i dont drive it like its stolen and i dont do track days

my gears are a bit notchy so i think oil change may help i have already changed the bushes to bearings

[gnzyza]

I will be using ecp's triple qx 75w-90 fully sythetic oil. Made by big brand and repackaged I think.

Some people rate valvoline but at that price point its semi synthetic.

Last change had redline and no issues with that either.

[tonym]

so have you use triple qx before?

[tonym]

im under the impression i need 4.1 litres for the turbo box and it comes in 3.78 if i use redline so i have to buy a big tub and then a litre also itss £87 all together off opie

[thomp1983]

Ive used both halfords and commas 75w90 with no issues, halfords is £10 a litre, comma about £8 if you look on ebay you can currently get the triple qx for £5.09 a litre delivered

[tonym]

millers do a trx oil ? any good

[gnzyza]

No not yet will be when I fire up the engine following a rebuild, but looking at the specs it seems fine. Sorry I meant comma not valvoline earlier.

[tonym]

cheers ill give it a go gotta be better than whats in now

one more thing sorry was i right about the 4.1 litre

[gnzyza]

I believe so if you have a turbo box with lsd. But it'll probably take less to fill due to not getting all of the old oil out.

[C35Rob]

just use the best oil you can afford, it'll be years before it needs changing again and really, four quarts of MT90 isn't that expensive.

fwiw I stuck this in my box when I changed the oil

http://www.opieoils.co.uk/p-68901-fuchs ... 5w-90.aspx

[tiff_lee]

I know i'm going to be opening a can of worms here but when I was looking into which oil to get the only oil I could find was rated GL5 which is apparently bad for synchro's...

Paper on it here
http://www.widman.biz/uploads/Transaxle_oil.pdf

or just google gl4 vs gl5 synchro and see for yourself.

IIRC the shearing strength of the GL5 oil is too great and actually peels the brass off, something like that was a while ago I read it all

[tonym]

theres a guy on here with some millers ee im having off him checked it out on opie and its seems sweet so im going for that