Really appreciate the feedback I got on my 30k maintenance. So, now that I'm coming up on 60k, I figured I'd ask again for some more feedback.

Here's what I'm definitely planning to do:

- Cabin air filter (OE)
- Trans fluid (Motorcraft XT-M5-QS)
- Diff fluid (Motorcraft XY-75W90-QLS)
- Brake fluid (OE)

I might also do spark plugs (OE), if I feel like it. If not, I'll do it 5k miles later per the Schedule 2 recommendation of 35k mile intervals (last replacement was at 30k, so I'd be waiting until 65k).


So, here's what I need help with:


1. I'd like to also replace the following, but I can't find the part numbers:

- Trans drain plug washer
- Trans fill plug washer
- Diff drain plug washer
- Diff fill plug washer
- That little ring that the ignition key **** clicks onto. Not sure what it's called...

Anyone have any pointers?


2. Also looking for feedback on whether to replace the coils whenever I do the plugs. I installed OE rev. C coils at 30k, along with OE spark plugs and wires. I have no indication that they’re running poorly. I’m thinking of getting an OBD scan tool (e.g. the OBDLink MX) for other reasons; would that give me any info that might suggest the health of the coils?


Any other feedback would be appreciated, as always!

 

Bump! Can anyone help me with those part numbers, at least?

 

You can find the part numbers at one or more of several online Mazda shops like Rosenthal, Jim Ellis, BestMazdaParts, etc. Here is the ignition thingy, for example:

BASE-**** (D6Y1-76-142) - $4.81 - D6Y176142

And, here's the oil drain plug washer:

DRAIN PLUG WASHER (ISH9956-41-400) - $0.61 - ISH995641400

You get the idea.

Your fluid choices are good, but I really like Redline MT-90 in the transmission and Redline 75W90 in the differential. I also like ATE Typ 200 brake fluid. With it, you can upgrade to DOT4 for only $16 per quart (really a liter).

 

Thanks, Steve!

I did try some of those but wasn't finding everything for some reason. Really appreciate the help.

 

I got my 09 GT from its first owner at 47k, he changed sparks at 37k without changing coils so I decided to change all of them at 50K even I did not have any starting issue at all. Found some white spot on old coils after I took them off, so sooner or later you will need to replace them.

 

Thanks for the feedback. Do you happen to know which revision the old coils were?

 

A white spot on a coil is meaningless. Even good coils sometimes develop white spots. (As an aside, some of my BHR coils have white spots from heat.) A white spot on the bracket means there was some arcing, which does indicate a bad coil.

 

Does anyone actually replace the copper washers?
in 18yrs of wrenching my own vehicles, I never have... and never had a leak.

Another vote for Redline fluids. Redline+Mazda = great combo.

 

I'm having a transmission leak at the drain washer at this very moment. Not even my handywork, I brought it to a shop to have the fluid replaced and they decided to save a washer.

 

I ran Red Line trans and diff fluids in my old E36 M3. Red Line is big in the BMW aftermarket, too.

In the trans, it felt really nice at first but the shift quality seemed to degrade after 15k miles or so. Motul Multi-ATF had the same initial shift quality but retained it better over the OCI. I don't remember any such issues with the diff, but I always thought it was weird that Red Line recommended 75w-90 for that car, which is a grade thinner than the OE fluid (75w-110 on the current scale) and two grades thinner than BMW's back-spec (75w-140).

Either way, the main reason I want to stick with big-name fluids is that I'm still under the CPO powertrain warranty. I want to give Mazda as few reasons as possible to doubt my maintenance. After that, we'll see.

As for the washers, I've only done one trans and diff fluid change, but I reused the washers and had no leaks. I just figure they're cheap and replacing them doesn't involve any real labor, so why not replace them this time around?

 

Let me know how that Motorcraft oil works out for you. A lot of Miata guys swear by it. I change my trans and diff oils every year in June, and I have been thinking about trying Amsoil. OTOH, I change it frequently enough, that it probably doesn't matter what I use.

BTW, I always just reuse the washers. Knock on wood, I have never had a leak before, but having to dump $36 worth of gear oil to change a $1 washer would kind of suck.

 

I put those same Motorcraft fluids in at 30k. No idea how to assess the diff fluid, but the trans feels good!

 

I left the washer off entirely from the drain plug when changing the diff fluid. . Found it when cleaning up. Could not believe it. That was a face-palm moment, never done that before.

I super-lightnin-fast removed the drain plug, popped on the washer and put the plug back in. Topped off the fluid - lost about 3oz!

 

Thanks for the info, it feels good to learn from this site everyday!

 

That is a bonafide NINJA move!

[Are those words allowed to be used together?]

My luck would be that I would only lose a few ounces of oil, but I wouldn't have any more, and would have to spend $18 on another quart just to pour that 3oz.

 

In the past, these are the part numbers I've ordered for the washers:

- Trans drain plug washer 995641800
- Trans fill plug washer 995641800
- Diff drain plug washer 995641800
- Diff fill plug washer 995621800 (this is the copper one)

 

Thanks for the find on the copper one.

Why copper on the diff fill plug and nowhere else? If that's what comes from the factory, do you know why?

 

Why in Copper?, well the Differential Filler Plug and its Washer is closer to the rear Exhaust Pipe which gets very hot, and I guess the copper only Washer is more tolerant to heat and temps...??