Outer Limits 4x4 Board

Anyone used penrite 80w90 gear oil in their standard zook 5 speed? If so how is it?

used it in my x-fer and diff, but haven't put it in the gearbox yet

I believe the sierra oil of choice is the castrol vmx 80 for gearboxes. I havnt used it but on the bottle it claims to work equally effectively when the gearbox is cold and cut down on gearbox noise. Im buying some soon as im sick of having to stop in slow moving traffic to get into gear.
As for penrite I wouldnt have a clue.

ill give the penrite a go. if its no good ill change to the castrol. will keep ya posted as to how it goes.

80w90 is to thick for any sierra gearbox

its for some transfer cases & none lsd/locker diffs
it will also drain some hp from the zook

id suggest castol vxm80 or valvoline 75w80 gear oil.

for better shift when cold use castrol syntrans but at $20. litre its on the $$$$$$$ side

Ok i might take one of the bottles of penrite back and get some syntrans since i leave for work at 5am and its about 2 degrees at that time here in tassie!!! Is the syntrans an automatic transmission fluid or just a general gear oil?? What the full name for it??

daryl wrote:80w90 is to thick for any sierra gearbox

its for some transfer cases & none lsd/locker diffs
it will also drain some hp from the zook

id suggest castol vxm80 or valvoline 75w80 gear oil.

for better shift when cold use castrol syntrans but at $20. litre its on the $$$$$$$ side

80-90 is the recomended oil for a coilly.

ok i bought some Castrol Syntrax today. Had to get two litres cause it only came in 1 litre bottle and the 'box takes 1.3 litres!!! Anyway it cost me $27 a litre. Better be bloody worth it!!!

The VMX 80 is great stuff, makes gear changes easy, stops synchro crunch and quietens down the whole box.

yeah the syntrax says its a great upgrade from the vmx. apparently (according to castrols description) its exactly the same as the stuff used in the boxes in both formula 1 and v8 supercars. Should bloody expect so at that price!