Best fully synthetic oil?

Duke of Cruel · Post by **Duke of Cruel** » Mon May 07, 2007 9:02 am

Hi guys,

what is the best synthetic oil for the manual tranny? And has anyone put in an tranny cooler?
DoC

VanDerGraaf · Post by **VanDerGraaf** » Mon May 07, 2007 11:48 am

Millers TRX 75w 90 is good and safe- you have to make sure whatever you use meets the spec otherwise you can kiss your bronze components and box goodbye.
Otherwise the official Volvo stuff will do.

There are bound to be others that meet the GL5 spec but that's research for another day....

Amonra · Post by **Amonra** » Wed May 09, 2007 8:35 am

i contacted the Maltese distributor for millers oils and he told me that the Millers TRX 75w 90 he has is a semi synthetic oil.
I am not really sure but is it equally good , or it will damage my manual tranny?

Ettore Bugatti · Post by **Ettore Bugatti** » Wed May 09, 2007 10:19 am

Renault boys use transELF.

derek uk · Post by **derek uk** » Fri May 25, 2007 10:55 am

Manual gearbox.......

GL-4 good - Redline MTL works well.

GL-5 BAD - Additives in GL-5 corrode bronze/yellow metals such as syncros and will damage your box fairly quickly. Damage to your wallet will follow shortly after.

JohnTurbo · Post by **JohnTurbo** » Fri May 25, 2007 11:31 am

Volvo stuff @44quid and TRX @25quid are the only options we know are safe.

VanDerGraaf · Post by **VanDerGraaf** » Fri May 25, 2007 6:20 pm

derek uk wrote:Manual gearbox.......

GL-4 good - Redline MTL works well.

GL-5 BAD - Additives in GL-5 corrode bronze/yellow metals such as syncros and will damage your box fairly quickly. Damage to your wallet will follow shortly after.

Erm, not according to Volvo specs.
Read This.

Or This.

Perhaps not all GL-5 spec oils contain the same additives. I spoke to a guy at Miller's Oil and he said their oils are safe for bronze components, as the modern additives they use don't have this problem.