Gotta change my tranny fluid finally, 40,000 miles, 10k over due. Anyways thinking about synthetic. Anyone have any experience on this matter?. Fluid right now smells a little burnt but is still red and tranny shifts sloppy, always did since day one. Does synthetic improve shifts on any of your trucks?. I know its better for heat and has more detergents but it is a little pricy. I just want to justify a reason to buy it. Thanks

 

1 word Mobil 1,

 

Forgot to mention Mobil 1 would be what I would use. Use it all of my engines. Good stuff

 

Question???
I have been thinking about sync trans oil as well but
1 sync oil is supposed to be more slick than dino oil
2 auto trans build heat if they slip and heat kills!
So why would I want a synthetic oil in there? I have switched in the diffs but not the motor yet because I have never had a motor fail due to oil, I change it often so I just don't see the need for the extra cost. In the diffs where it is in there longer and is neglected I see a big reason and was thinking the same in the trans because of the time between changes.

 

Synthetic will run almost 100 degree's cooler. Thats why we run it in all of our engines and ladder trucks. It helps out when you are pushing 50,000+ lbs down the road like a sports car with a 470 hp engine.

 

Greg,
I use synthetic oil in the engine's, trannys and diff's of all of our ambulances and have had great luck with it. The average life for a tranny in an E-350 ambulance chassis is about 40 to 60 thousand miles. We regularly get 100 to 120 thousand miles out of them. This is a VERY rough service application so it should work well in your truck. I just changed the rear end ger oil in my pickup (2000 F-250) today and used the synthetic. 15.99 a quart. OUCH! Oh well it'll save you in the long run.
No Worrys,
Klr

 

All MERCON-rated tranny fluids have to meet the same spec for slipperiness (or rather stickiness). Syn won't make your tranny slip.

Syn. will take the heat better and has a higher heat capacity, which means that it can carry more heat away from the tranny and to the cooler. That is why syn. runs cooler than dino.

If you don't tow or carry heavy loads very often, dino is probably just fine for you.

 

I would still use syn, whether you use heavy loads or not. I have changed many a tranny fluid and until I started using syn, they all smelled burned even after only 25k miles. Syn is definitely the way to go.

Also, I wouldn't think that a good syn trans should cost more than $9 a quart or you are getting ripped off.

 

INTERESTING! I just went to the Amsoil site that is below this posting to find out how much thier trans oil is and guess what? They won't tell you unless you buy some. Sorry I don't trust ANYONE who won't tell me a price ahead of time and right up front!
Klr

 

Amsoil would rather you buy from their dealers!

 

I got a price of $5.99 a quart of Mobil 1 Synthetic Tranny fluid at Auto Barn. Not that bad of a price but 18 quarts + a filter will be a little pricy. Hope its worth it.

 

Update on price. $4.99 a quart at autozone. Wiped them out...lol. Job done along with transfer case fluid and rear end juice. Pain in the butt changing the tranny fluid

 

Hello All.
Most new Fords come with Mercon 5 which is synthetic. Check your tranny for aplication. We have seen many toasted trannies where I work.

 

Typical of a MLM company!!!! Stay away from Scamsoil!!!!!! If your transmission calls for Mercon V, ONLY use Mercon V, NOT synthetic!!

 

Greg,
When you changed your rear end gear lube did you use the 75/140 synthetic thats called for and if so how much did you pay for it?