Royal Purple in my Tranny

[joe-yamma]

My dealer swapped out the axles (gear) and transfer case (ATF) with Amsoil (that I provided) for me when I did the 30k service, no problem.

When I got my tranny done awhile back, they dropped the pan and replaced the gasket and then flushed and filled with the Amsoil ATF that I provided.

Whatever brand, syn is better than regular and most any decent mechanic will tell you that.

[Heraclid]

Offhand, I believe the interval for tranny fluid replacement is about every 25,000 miles. Your manual should say. More often can't hurt and I think Tone once said he does it every 15,000. I did the differentials myself with Royal Purple and have no complaints. Like you, I wanted to go with it in the transmission as well. I offered to supply the fluid but the place I used said that the machine they had was set up on Mobil so I reluctantly told 'em go ahead. Really wanted to run Royal Purple there too but since it is a very reputable shop around here I gave in rather than take my chances elsewhere. I had them drain, flush and refill, and had the filter replaced. Make sure that the filter you get comes with gasket made of something other than cork. A simple drain and fill doesn't replace all of the fluid or force as many contaminants out.

[biju]

Jimbo,

RP MAX ATF isn't Dexron III, (granted) as only Dexron III is, well, Dexron III. I had the same questions/doubts when researching as to the compatibility...

According to RP: "Max ATF® is recommended for all applications where Ford MERCON»® / GM DEXRON® III transmissions fluids are specified."

I'm comfortable using MAX ATF in place of Dexron III for my tranny, and so is my mechanic. I'm sure there's more than a few people here that have used MAX ATF, (or another synthetic brand), in place of Dexron...

On another note... Dexron III is the fluid used in our powersteering. I'll probably start another thread where I could use some clarification on if I can get away with using RP's 'MAX EZ' power steering fluid.... So, I guess I have a similar concern, just different part of the VX...

[jimbo]

Thanks Biju- Well, that clears up why the mechanic at the dealer had an issue with the Royal Purple. He probably had to follow certain "rules" layed down by his bosses. Which doesn't mean Synthetic is bad, surely it's better. But ... I guess it might affect the warrantee though.

Do you know if putting non-dexron III in voids the warrantee? I think my power-train warrantee is still good til this October. Maybe I'd better wait.

Also: I'm assuming flushing is the way to go if switching to synthetic. Is this true? (pretty obvious I guess)

[Joe_Black]

As long as whatever product you're using meets the manufacturer specifications (API/SAE etc.) then they can't void your warranty unless they SPECIFICALLY mention certain products, which they can't of course as that get's them into anti-trust legal territory.

Everyone knows I'm a big Mobil-1 nut but keep in mind that there are only two true synthetics currently available: Mobil-1 and Amsoil. Since there's no regulatory requirements for the sale of synthetic or synthetic blend lubricants, the marketers can make all the claims they want as long as there's at least something like 1 part-per-million of synthetic material in the product. Food for thought. Mobil-1 (and Amsoil to a lesser degree) has an impressive and proven track record since 1975 (XRN 1669 - SAE Paper 750376) in aerospace, marine, professional racing, industrial, commercial, agricultural and extreme enviroments. Royal Purple just has a website and colorful adverts. But hey, if it makes ya feel good...

[jimbo]

I know, I know but don't confuse me with the facts

Well, I got the royal purple already, and it aint cheap! Guess they got to pay for that website.

[Tone]

Amsoil and Mobile 1 are NOT the only synthetics that start with sythetic bases. I spoke with a number of companies at SEMA and they are closing the gap or surpassing those who started this trend.

An email to me from Royal Purple Engineering: "Royal Purple combines the highest quality synthetic base oils with its synthetic, proprietary SYNERLEC additive technology. Amsoil and Mobil 1 both start out with the same base oils as we do, these base oils are call PAO's (polyalphaolephins). The additive packages make the difference."