Another V70 trans fix ?

Post by **T5AUS** » 12 Nov 2010, 13:31

I was at my local Volvo wreckers yesterday getting some parts for the old 850 T5 and I mentioned to the owner my recent V70 T5 trans woes and he suggested trying the Nulon additive after flushing. One of his customers, after doing several full trans flush and refills with the mobil 3309, was still getting slight flaring and bumping in the lower range and so added the Nulon additive http://www.nulon.com.au/products/Auto_T ... Treatment/ and reckons the flaring and bumping stopped completely. I have never heard of this being used before but I guess worth a try if things are still not right for some of us. Would appreciate any comments for or against

randyman · Post by **randyman** » 12 Nov 2010, 16:31

I have seen this behavior myself. I am very interested in hearing any feedback from the other members..........

jda2000 · Post by **jda2000** » 12 Nov 2010, 16:50

Looks like the Seafoam transtune product, but with the stop oil leak feature and that is the problem with this product.
Seafoam transtune does not swell up (rejuvenate) old hardened seals, is just a cleaning agent to remove gunk from small openings and small moving parts and is recommended to use just before a fluid change, the opposite of nulon.

I wouldn't want to use a product that needs to stay in after a fluid flush and swells seals. just my 2cents.

1foren · Post by **1foren** » 12 Nov 2010, 17:30

My V70 has a 130k on it and I used the Seafoam product and had a improvement, It went from basically every shift to a daily 3 to 4th flare. I'm not big on the swells seals things either.. Coming up on 3k and I am going to Seafoam and flush it again.. keeping my fingers crossed...

Retired MVS Contributor · Post by **Retired MVS Contributor** » 12 Nov 2010, 17:33

In older hydraulically operated transmissions, as well as in the modern electronic ones, the principle cause of shifting problems was the formation of varnish on the sliding valves, causing them to be sluggish or to stick altogether...Most of this varnish comes from overheating of the transmission fluid, especially bargain fluids, and to a lesser extent, from non-metalic clutch and band friction material...Detergent type additives are intended to disolve the varnish and free up the valves...It often works, but sometimes the valves are so worn that once the varnish is gone they are so loose that they leak and by-pass...Then we have bigger problems...The best plan is to keep the fluid changed and don't overheat it (and if you do, change it ASAP)...I tend to agree with the writer who does not like additives that swell the seals and I too avoid it, but I cannot say that it does not work, I just don't know...

Post by **T5AUS** » 13 Nov 2010, 22:03

Thanks guys