Swepco 201 vs Royal Purple gear oil

[Benny771]

Any reason to sway towards one or the other? I have a 1989 930.
I have read that Swepco is a good choice but Royal Purple i can get close to home (canada Ontario). Its a weekend car that does not spend any time on the track............................

Thx for the advice in advance.

[Benny771]

Nothing ???

[Adam144]

We run Swepco in the street car and race car. I see no reason not to.

You can get it easily in Ontario, our independent Porsche mechanic usually stocks it.

Response Engineering: 416-526-3487

Tell him Adam from Peterborough with the two 930s sent you. He is very reasonable, knowledgeable and helpful. He is located in Whitby.

[unclebilly]

Call bearing and transmission.

[Jeff Alton]

You can also try the Brad Penn "Classic" 80/90 which is the old Kendall stuff. We have been using it with good results....

Cheers

[David]

I use Swepco but I've heard very good things from racers using Royal Purple in light weight formula boxes that are prone to failure with other oils.

[myturbo2]

FWIW, I run Swepco in my gear box and the thicker dino oil makes shifting feel a bit notchy so, I'm considering going back to a synthetic...

[philip j]

I'm running swepco 201 in my newly built box. It's a real workout to pull it through the gears, even with a Wevo shifter. I may consider a lighter synthetic oil next time.

[Benny771]

Does Swepco have something in it that our gear box's need, that R.P does not ??

[mystro]

I am running Royal Purple. Smooth and precise shifting. I am sold on RP products through out the car. I think it is a superior product in general. Its not cheap but who cares if its the best.

[Benny771]

What weight are you using??

[philip j]

you're probably running a G-50, looking at your signature. The 930 gearbox is alot different. I think 75W-90 would be what should be used, but it would be interesting to see if a lighter oil could make the shift easier. My new box is tight! It feels like I'm dragging the shifter through a tub of molasses.

[jwasbury]

If you read these forums obsessively, you may come to the conclusion that Porsche transmission will explode without Swepco lube, and Porsche engine will destroy itself unless filled with Brad Penn Oil. I certainly think that these are good products, but there are other good products out there.

I recently filled my 930 4 speed box with Motul Gear 300-LS 75W90. Meets/exeeds GL4 & GL5 specs. Full synth with Motul's super special double ester molecule blah blah blah blah...same tech as in the very highly regarded 300V motor oil. This $hit is ludicrously priced, but it does appear to be regarded as top of the range. Good enough for me to swallow the bill and try it out. So far I think my 930 gearbox has never felt better.

[winders]

Originally Posted by jwasbury

If you read these forums obsessively, you may come to the conclusion that Porsche transmission will explode without Swepco lube, and Porsche engine will destroy itself unless filled with Brad Penn Oil. I certainly think that these are good products, but there are other good products out there.

I recently filled my 930 4 speed box with Motul Gear 300-LS 75W90. Meets/exeeds GL4 & GL5 specs. Full synth with Motul's super special double ester molecule blah blah blah blah...same tech as in the very highly regarded 300V motor oil. This $hit is ludicrously priced, but it does appear to be regarded as top of the range. Good enough for me to swallow the bill and try it out. So far I think my 930 gearbox has never felt better.

The transmission in your 930 uses a Porsche-style synchro system which does not do well with synthetic oil. The system needs the friction to function properly. But you use whatever you want....

Scott

[JFairman]

Well ya couldn't pay me to put synthetic oil in a 915 or 4 speed 930 gearbox because I know better - it is the wrong oil for the porsche steel synchro rings.

Synchro units work to match gearset speed before the gear being selected is fully engaged and they work on friction.
Synthetic oil will wear down the sharp grooved inner diameter of the porsche synchro ring faster than petroleum base oil because it is too slippery and lets the synchro ring slip too much as the synchro slider is pushed over the top of the porsche split steel synchro ring and the synchro ring is compressed and squeezed together against the rough outer surface of the energizer ring underneath it.

Synthetic oil works great with the different design Getrag synchro units with brass synchro rings used in all BMW transmissions going back to the 60's or earlier and in the Porsche G50 transaxles.

The 930 4 speed gearbox used up to and through 1988 is the last transaxle Porsche designed and built themselves.

Everyone has their own opinions though so I'll throw in mine...

You can waste yer money on overpriced boutique blue or purple gear oils but none of them are any better than Kendall 80W-90 GL-5 Gear Oil With LSD Additive and it cost less than all the other flavor of the month gear oils.

Pelican sells it...
Pelican Parts - Product Information: KEN-LSD-7745

[Benny771]

I wisk i could get it here in Canada (Kendall 80W-90 GL-5 Gear Oil With LSD Additive). So im searching to see if Royal purple is good for my g50 or i have to drive 2hrs to get me some Swepco.

Apparently we are not allowed to get "fluids" from the U.S.A.
It started out as a simple question.

[unclebilly]

Did you call Bearing and Transmission (now called Applied Industrial Technologies)?

This is where I buy swepco, they can get it for you and don't even add the Porsche markup...











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[Benny771]

Ya, thanks.
Problem is im 40 min nort of Barrie. I am stopping in Guelph today to see if i can get some. Its 2hrs south.

[JFairman]

Your '89 930 transaxle is not made by Porsche like all the Porsche 930, 915, and 901 gearboxes made before 1989. Your '89 G50 5 speed is made by Getrag for Porsche and it's a better more modern shifting gearbox because it has the borg warner synchro units that work fine in GL5 synthetic gear oil.

I'm mentioning this because you sound like you want the non synthetic swepco GL5gear oil.
Either one will work in your G50 but the synthetic oil will work alot better for you because it doesn't thicken up as much as non synthetic oil when it's cold so being in Canada you'll have much smoother and faster synchro action when shifting with synthetic gear oil on cold days.

Not trying to confuse you but just about any top shelf 75w-90 or 80w-90 GL5 synthetic gear oil will work great in your G50. If you have a LSD differential be sure to get the gear oil with limited slip additive or the LSD clutches will chatter when accelerating around slow corners.

Redline, Amsoil, and Mobil One Delvac are three of the best top shelf synthetic gear oils made in the states. The Porsche factory fills their new Getrag transaxles with Mobil One Delvac synthetic gear oil.

Royal Purple synthetic may be good or it may be all Nascar marketing behind it.. I don't know anybody that uses it and the others have been around alot longer and are proven name brands.

[Geary]

Originally Posted by JFairman

Redline, Amsoil, and Mobil One Delvac are three of the best top shelf synthetic gear oils made in the states. The Porsche factory fills their new Getrag transaxles with Mobil One Delvac synthetic gear oil.

I would dispute this statement. Amsoil is at the bottom of any list I'd make up (with a history of failing API certification), and Redline failures I've seen firsthand .. more suited to transmissions, not transaxles with R&Ps. Delvak is OK .. but certainly not the best of all available synthetics.

Benny .. Swepco has a superior EP additive package than RP. Ask the 901 Shop about their experiences with RP.

In someone's non-scientific comparison of a few oils recently presented to a number of us, The transmission with Amsoil ran the hottest, with RP not much cooler.

You cannot judge an oil solely by how smoothly it shifts ..