[91bowtie]

My trans is stock never touched. So even here some of you guys say 668 is ok but another says it’s not good on seals. This is what makes me confused.

 

[91bowtie]

668 is okay, Dexron 6 might be an issue. 2 different fluids. The 295 and 668 specifications are from Allison themselves. Dexron specs are from GM. The Schaeffer product Rob is using is a Dexron 3 product for example (a very good one at that).

So is the Shell 668 I posted alright of an oil?

 

[91bowtie]

Thanks all for replies.

 

[91bowtie]

Just a bit of an update that makes me more confused, I called a dealer and they say use their DEX VI that’s what they put in all their trucks.
Problem is that Shell668 I was looking at is getting discontinued at where I found it and afraid of mixing fluids later on. I’m thinking I should use TES295 from all the reading I’m doing but finding it hard to find around here, any suggestions on readily available fluid brands. Keep in mind I’m in Canada so maybe Piper can be of some help. Thanks

 

[91bowtie]

Thanks everyone, this is a great place to learn.

 

[91bowtie]

668 fluid can be found at most truck (big) dealerships as well as 295. The 295 fluid is on the way out, being replaced by 668. Both 295 and 668 are FULLY compatible with each other and will also not do anything bad if they are mixed with Dex6 while you are in the process of changing over.

As Rob mentioned, a GM or light truck/car place will only have or recommend Dex 6.

I'd try Rush Truck Centers (International dealer) or the Freightliner dealer up there (I think it's called Francis now). International has a fully licensed house brand (Fleetrite) of 295 that's as good as any other 295 fluid. Your also likely to find the actual Transynd branded stuff (Castrol) in either 295 or 668 at many dealers. Any dealer that does a lot of school bus or government trucks (snowplows etc) is likely to have it since those vehicles are almost 100% Allison automatics.

Don't get hung up on whether its 295 or 668. Either is vastly superior to Dex6, especially in the cold and are fully compatible with each other.

Fleetrite is $152 gal. 😵‍💫

 

[91bowtie]

Summitt Racing has the Mobil Delvac 295 Allison approved ATF (may be 668 now) at a decent price. Last time I ordered from them, purchases over $100 get free freight, may have changed but worth looking into.

Shipping is never free to Canada, and shipping costs are crazy……sometimes as much as product.