Right oil for transmisson?

[RITTER]

DEXRON III / MERCON is the superseded fluid for the original DEXRON II fluid. The DEXRON VI fluid is a full synthetic replacement. If you are to use the DEXRON VI, you would need to flush the entire system replacing all the fluid with DEXRON VI. They do not recommend mixing the two fluids.

 

[olds307 and 403]

Dexron 6 is a synthetic blend, not full synthetic. I used Dexron 6 in my 94 4L60E, when I replaced the trans. I also used Dexron 6 in my replacement 2004r in my Cutlass. I used some Dexron 3 with it when changing the governor and fixing the TV cable. Dexron 6 is supposed to be backwards compatible and superior. I have used the Valvoline Dexron 6 with seal conditioners and Mobil Dexron 6, neither said anything about no mixing with older fluid.

 

[RITTER]

The Valvoline DEXRON VI bottle says "full synthetic" right on it :arrow:

 

[Lorenzo]

This oil doesnt say anything about it being synthetic. Just Mobil Super ATF D/M, FTA D/M, also says for ford and GM vehicles. Is it ok?

 

[Oldsmoletick]

Yes, I supply Mobile atf D/M for any vehicles that come into the shop requiring dex II or III (gm dealer). As well as my own vehicles, all which called for dex II.

 

[Lorenzo]

Yes, I supply Mobile atf D/M for any vehicles that come into the shop requiring dex II or III (gm dealer). As well as my own vehicles, all which called for dex II.

Ok thanks! Also will having low fluid in the transmission affect fuel mileage at all?

 

[olds307 and 403]

Valvoline Max Life just says synthetic base oil, just checked. The Mobil says synthetic blend. The price of Valvoline is very cheap at Walmart here. Not even $5 a liter in the 5L container.

 

[grand86prix_05]

Yes, I supply Mobile atf D/M for any vehicles that come into the shop requiring dex II or III (gm dealer). As well as my own vehicles, all which called for dex II.

Ok thanks! Also will having low fluid in the transmission affect fuel mileage at all?

it can...if your trans is starting to slip, if that were the case then the bigger thing to worry about would be the transmission frying itself. Low level can cause aeration of the fluid, which can cause slipping but on small drives and usually if it isn't very low you will be ok. How do you know your fluid is low anyway? Did you check it properly?

 

[RITTER]

Valvoline Max Life just says synthetic base oil, just checked.

Hmmm, don't remember saying anything about Valvoline MaxLife :| But "synthetic base" means that that is a synthetic oil

 

[Lorenzo]

Yes, I supply Mobile atf D/M for any vehicles that come into the shop requiring dex II or III (gm dealer). As well as my own vehicles, all which called for dex II.

Ok thanks! Also will having low fluid in the transmission affect fuel mileage at all?

it can...if your trans is starting to slip, if that were the case then the bigger thing to worry about would be the transmission frying itself. Low level can cause aeration of the fluid, which can cause slipping but on small drives and usually if it isn't very low you will be ok. How do you know your fluid is low anyway? Did you check it properly?

Well i went to check it while car was running and was back after a half hour drive and it was at the very end of the dip stick in the last section. When the everything is cold the fluid is pretty high up