Has anyone tried this in their FD? I put it in my supercharged miata and it is AWESOME. I put neo-synthetic into my FD and it's alright, gets better when it's hot. If it makes my FD shift like my miata I will be very happy.

 

Not that I've heard of. Check the specs on it, it's worth trying out!

Dale

 

I work at a Ford dealer. I checked the history on that part number. We rarely sell it except to Miata guys. Yes I have an FD and I don't use it in mine.

 

Off subject somewhat, any insights on Motorcraft 5-50W Full Synthetic engine oil?

- Top-quality motor oil required for Ford GT and Ford Mustang Shelby GT-500™
- American Petroleum Institute (API) Service Category SM
- Manufactured with high-viscosity index, premium-quality, synthetic base oils and performance additives that provide wear and oxidation protection under severe operating - conditions
- Resistant to deposit formation, including supercharged and turbocharged applications
- Provides quick flow to engine parts during start-up and lubricates effectively over a wide temperature range

On subject, i am very happy with NEO, but if there's something even better (which i doubt), i'm interested

 

The reason that Ford wants to use a 5w50 is because of cold start requirements. They want the motor to reach operational temperature as fast as possible, which cuts down on emissions. The oil is actually a 20w50 with synthetic additives to make it perform like a 5w50

 

I've had good results with Motul gear 300 or Idemitsu 75w90 but honestly there is very little difference in real world performance between all the name brand oils.

 

IMO, there's more difference in ease of shifting (synchro performance) than durability performance. The OE trans lube was good, Valvoline 75W90 synthetic not good, and the NEO synthetic was better than the Valvoline, and close to the OE in shifting ease. I still would like it to shift better cold than it does with the NEO.

 

Will be watching this thread - I used that fluid in my NB Miata (w/ Aisin 6 speed) and it was a night and day difference, shifted amazingly. I was planning to use it in the FD when the time comes & will be very curious to hear your review if you try it in the FD.

 

somebody ought to look up the fluid Ford wants for the Mazda R box when its in one of the 80's pickups.

 

I have idemitsu oil and when cold it shifts pretty lousy.

 

If you try it let us know the outcome. Over the years I’ve tried various oils for track use. Used Amsoil for a number of years as they made a specific GL-4 trans oil. The last couple years I’ve used Neo RHD which has seemed to hold up better to track abuse. Both shift roughly the same on the street.

 

^ Smokey, Any difference in cold (i.e. not warmed up) performance between HD and RHD?

 

I’ve only run the RHD neo, but found cold weather to be similar to Amsoil.

 

I've used it in my Mazdaspeed 6. Unbelievably fantastic stuff. I have an extra quart sitting around that I'm going to put in the FD when I get around to ordering more. Really expensive stuff, though.

 

My understanding is not that it speeds up how fast the engine warms up but has the viscosity of a 5 weight oil at room temp and a 50 weight at operating temp. I read that something like 90+ percent of engine wear (not including blown apex seals ) happens before the engine is warmed up and the oil is still very viscous. a 5w50 sounds awesome if you run 20w50. I run mobil one 0w20 and 0w30 in my daily drivers. im not convinced that 50 weight oil is best for the FD though.

Matt

 

gonna try this transmission fluid in a friends RX-8 this weekend, will report back with results

 

8 gearbox, unlike the 7, doesn't have a notchy1>2 shift nor does it (ever) have a problem going into second when cold.

 

I bought my series 1 8 with 16k miles on the clock. 1 -> 2 shift is awful, but I think the only previous owner somehow managed to tear the 2nd gear syncros up before I bought it.

Very unrelated, but the 1->2 shift comment cracked me up and reminded me of it.

 

My 8 shifts the same ( no problems) with OE or NEO. FD with NEO has a tougher 1>2 (when cold) than I remember vs previous fluids (i.e. OE, RL MTL); that, or maybe I just forgot about past cold shifting.

 

I use it in my RX-8 ( Series I. Aisin AZ6, same transmission.) They are known for being made of glass. In my particular experience, after switching to this fluid, my 2nd gear syncro issue went away. Personally I swear by it.

 

Anyone know what the difference is between XT-M5-GS and QS is off-hand? Apparently both are popular with Miata owners.

 

XT-M5-GS appears to be a typo...

 

Thanks, my mistake. Should’ve put my readers on.

 

Put some more street miles on the car this year and would rate cold weather shifting as “ok”. I have to be very deliberate and slow going 1-2 shift to keep from forcing it and/or having some notchiness going into 2nd. Once warmed up no issues. I’ve continued with Neo because on track use but interested to hear if anyone has put the motor craft through similar abuse.

 

I've been wondering about this in the FD trans as well. I ran it in the RX8 for about a year and it felt good, but introduced a pretty strong trans whine when I put it in that persisted the remainder of the time I owned the car. The transmission had 100,000 miles on it and I had used Pennzoil Synchromesh previously though, so it's possible that the sound was just introduced because of damage from a previous fluid setup and the flush of any kind of new fluid could have made that apparent.

Honestly I'm probably just going to do it since I put the Pennzoil stuff in the FD as a temporary test and am not liking it (way too thin for the FD IMO. Will report back if/when I do!