Royal Purple Gear Oil

[Qproject]

my mechanic just changed my differential fluid with royal purple gear oil (y33)

was it just a waste ?

[silver2k2]

Not at all the differential takes alot of abuse, good fluid is a plus

[Jesda]

RP products are junk, because theyre outrageously priced but no better than the cheap stuff off the shelf.

[elwesso]

Ive been converting a lot of fluids on my car from synthetic back to conventional, but differential is one I wont. the diff has no cooling and, especially how I run it, must take a beating....

The diff is one thing I keep synthetic in. I dont know how much better RP is then say, M1 or something (if i recall, RP is priced about the same as redline), but I wouldnt call it a waste.

[Q45tech]

An extra $10-$12 [above conventional] every 30,000 miles is insignificant compared to the other $5-6,000* you would/should be spending over the 2 year period.

Unless you've ever paid $3,000 for a new dif or even $500 + labor for a used one you might kick yourself for cheapening out or prolonging change intervals.

The problem is good used PROVEN low mileage [under 100k] are now almost impossible to find.

* Synthetic everything only adds $320 every 2 years vs conventional fluids assumming 4 oil changes per year and an AT, PS, Diff change every other.

[elwesso]

See I do oil 3-4x yearly, and EVERYTHING else is yearly (diff, PS, brake fluid, trans). Ive never done a cost analysis but I figure that yearly fluid changes and using all decent fluids I cant go wrong.

[qship96]

[QUOTE=elwesso]Ive been converting a lot of fluids on my car from synthetic back to conventional, but differential is one I wont. the diff has no cooling and, especially how I run it, must take a beating....

Thats the dumbest statement I have read in ages! If you are running the car hard and the diff. is "taking a beating" as you state..... the engine and transmission are working overtime to produce and transfer that energy{power} to the differential!,and you are downgrading their fluids from synthetic to dino? False economy ole boy

[elwesso]

The thing is though, the oil and ATF are changed regularly enough that they dont ever get really bad. Right before I bought the car it had an ATF flush with M1... When I took it out, it looked great. Same way with the oil, I used synthetic for the first 1.5 years of ownership...

The synthetic didnt seem to hold up any better than the dino fluid, so i figure I might as well use the dino fluid.... I dont really think the oil analysis things are worth anything unless you do a bunch of them to see trends, doing just one doesnt really do anything for you, in my opinion. Changing oil every 90 days works for me, then I dont have to worry.

With a trans cooler, my trans never overheats. My oil still looks fine (mobil clean, whatever the synthetic blend is)....

I'll run my dino oil, change it regularly and be no worse off, and have fresher fluids in my car... Fresh dino fluid is ALWAYS better than older synthetic.. So I'll use conventional every year in my trans than do 2 years on synthetic... If someone asked me if I recommended running synethic in a Q, i would tell them to run conventional fluid but change it very regularly. The fact is, for the driving that 95% of Q owners do they dont need synethic. They need to keep whatever fluid FRESH.

Synthetics IMO do have some advantages in some cases however I think it makes people feel better rather than having a strong factual advantage... If the fluid is fresh enough to put it back in the bottle when you take it out of the component, it doesnt matter what you use (to a certain degree)

[qship96]

Longevity is only one advantage of a full synthetic over dino-which as you state isnt that important if you change your dino juice often,however dont discount the other important advantages of a true full synthetic such as lower evaporation{boil off} which keeps your PVC and intake path cleaner,quicker pumping especially in cold weather to get the lube up to the moving internals quicker thereby lowering wear,usually better detergent package to keep engine cleaner,better high temp handling to prevent sludge,etc
Modified by qship96 at 1:58 PM 8/19/2007

[maxnix]

I just changed out RP 75W-140 and it performed well. Went to Amsoil, very expensive in comparison. Multilevel marketing.

Changed the other one to M1 75W-140. Only saved about $14.

Engines that run with frequently changed synthetics have much less varnish than even frequently changed conventional (no, it almost exclusively does not come from dinosaurs) oil.

The advantage of synthetic is not so much longevity, but a larger performance envelope before degradation appears at thermal extremes.

[elwesso]

Im just saying, my experience has not been such to want me to continue to use synthetic. I still had to clean my TB yearly to keep it sparkling, while it may have been slightly less clean, it was not spotless...

You do make a valid point with the cold start, and this winter I may use mobil 1 in their 0w40...

For me though, I dont think that the extra money is really worth it. I may be more anal about changing things and keeping clean than others, so a little extra deposit on the throttle plate isnt gonna matter since I clean it frequently anyway...

[AlabamaDan]

I do use synthetic because I buy into the hype that it's better. Also, if I don't get my oil changed every 3000 miles/3 months I figure it's a little insurance. Perhaps over the looooong haul it will help my engine run better/longer.

[AlabamaDan]

Oh, and plan to switch to RP Gear Oil in my Q soon too. Should you run it around a little to warm it up before changing?

[qship96]

Drive around and drain it hot! that way it is thinner and flows out faster and any debris is in suspension and is removed with the oil-wipe magnets off on plugs while out.

[T45]

They have some great videos on their website, royalpurpledotcom, from some very respectable shows. A few including dyno runs. I am a believer and if you watch the "TRUCKS" video you'll see quite a difference.

That's not to say that RP is any better than any other syn, maybe Mobil 1 frees up just as much HP? Who knows.

[Skibane]

Have no personal experience with Royal Purple, but am convinced that Red Line's gear oils (and ATFs) are easily worth the extra cost.

[qship96]

Redline is one of the very few to use a group 5 poly-ol-ester basestock in their motoroils,ATF,and gear oil- almost every other synthetic is a group 4 based product,some even a group 3 "fake" synthetic