royal purple or other synthetics

[SX5_MD]

Anyone out there try using RoyalPurple or say G-oil in their 2.4 yet? I'm looking to get an edge up on our gas mileage. Thinking of switching out the trans fluid with RoyalPurple too.

[trevorusn]

I'm curious on this too. Is RP worth the premium???

[Forte333]

i suggest to just swap out engine oil and leave the tranny to factory,

one member (blackwatch or blkwatch?) had swapped out tranny fluid to fully synthetic and ran into issues, besides oem is semi-syntehic already.



now im not implying that anything bad will happen, nor am i saying you shouldn't based on the fact one member had a bad experience - all im saying is that ive switched to mobile1 for my engine and its fine. I left factory semi-syn tranny fluid.



to each their own.

fyi; yes the fully synthetic oil helped out with a little better MPG but not huge and its the same really especially when i drive the car hard or let it warm up for a minute or two

[lowkoup10]

I used royal purple for 10,000 miles made no noticeable difference

[Dvipercop]

I put royal purple in my tranny too, no noticeable difference. Gonna try Amsoil next time.

[LiveReckless010]

I use Mobil1 full synthetic 5w-20 and I noticed a slight difference from the bulk oil crap that Kia uses

[civicKillR]

On all my cars i've ran pennzoil platinuim. FUll synthetic, and has cleaning additives with a k&n filter. Thats all i put in my spectra5- 160,000kms and not a problem

[tcope]

You simply are not going to see a difference in mpg by using Synth... despite what "some" (Amsoil) companies claim.

[BLFORTE]

Originally Posted by SX5_MD

Anyone out there try using RoyalPurple or say G-oil in their 2.4 yet? I'm looking to get an edge up on our gas mileage. Thinking of switching out the trans fluid with RoyalPurple too.

I sent an email to royal purple because thier oil did not have the proper symbol on the bottle as specified by GM. This was the response I got, in my email I asked if it would void my 100,000 mile warranty. Hope this helps!!!

Good Morning John,

The API starburst symbol is shorthand for ‘EnergyConserving’ oils that are licensed with whatever the current API rating happens to be (API SM is now current). Along with the new API SM rating came the ILSAC GF-4 rating (they usually go hand in hand). ILSAC GF-4 requires a reduction in anti-wear additive. The reduction was deemed appropriate by automakers because they are now required by the EPA to warranty a vehicles emissions system separately from the power train and phosphorus (a component ofZDDP) is detrimental to catalytic converters is introduced directly to the cat in sufficient quantities. We at Royal Purple believe this to be an incorrect finding an that trading engine wear protection for the possibility of extending catalytic converter life is a poor trade-off. The OEM perspective is understandable, though, because warranties represent a huge potential, and actual liability, and once the power-train warranty is expired, the vehicle owner is responsible for engine repair.

Most Royal Purple SAE oils are API SL rated (not 0W-40, 5W-40,or 20W-50) and meet the performance requirements of GM 6094M. However, to be certified GM 6094M compliant, the oil must be API SM rated. The 6094M spec is a cold flow requirement for motor oil; the oil must be no more viscous than the values shown. Below I have listed the GM requirements and RoyalPurple’s performance.

GM6094M:

For 0W-XX oils - 30,000 cP@ -40°C
For 5W-XX oils - 40,000 cP@ -35°C
For 10W-XX oils -50,000 cP@ -30°C

Royal Purple:

For 0W-40 oils - 20,000 cP@ -40°C
For 5W-20 oils - 22,200 cP@ -35°C
For 5W-30 oils - 34,800 cP@ -35°C
For 5W-40 oils - 21,500 cP@ -35°C
For 10W-30 oils -18,000 cP@ -30°C

Higher numbers indicate a thicker, or more viscous fluid. A scan easily be seen, Royal Purple motor oils have much better cold flow (lowerpumping viscosities) than required. While the Royal Purple motor oil you are using meets or exceeds all the performance requirements of GM6094M, we cannot claim compliance because of what is basically an administrative requirement. However, we at Royal Purple do understand the warranty concerns of our customers so we offer a retail warranty to supplement the OEM warranty received with the purchase of a vehicle. Please see attached for more detail.

Thank you for using Royal Purple and have a great day!


Best Regards,

Christopher Barker
Tech Services
Royal Purple, Inc.
1 Royal Purple Ln.
Porter, TX 77365
281-354-8600

[Walpole5]

If you are going to switch your manual tranny fluid, go to this:

Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MTL 70W80 GL-4 Gear Oil

I've had it in my car for about 15k miles. It's excellent. It smooths out the shifts, cold weather shifting is eased, and it just makes for easier driving, it's almost Honda slick now. I highly recommend it. Don't go with synthetic. I did and it made the transmission shift worse and the cold weather shifting horrible. Strange, but true.

I have been using Mobil One 5W-20 in my engine for about a year. If there is an improvement in mpg, I haven't seen it.

[haydenks]

Don't waste your money - use a good quality fully-snythetic oil & change it every 5,000 miles!!

[SLEEPS]

Ive used Oreillys Synthetic oil since my first change. I dont know about MPG difference, but I am happy with it. I have use Mobile 1, and Royal Purple in other cars I owned, never felt like my cars as daily drivers needed that expensive of oil when regular did just fine.

This will be my first new car and first car that had synthetic its whole life, so in a few years I shall have a better understanding of, if it is worth it.

[CorsaKoup]

Synthetics in modern cars serve 2 purposes: Extending oil drain intervals (keeping in mind you should never go over what the owner's manual calls for) and protection against thermal breakdown. Another side benefit is that they don't thicken in cold temps like conventionals, leading to easier starts.

Over the course of 100,000 miles of normal use, at factory-prescribed OCIs, conventional oil breaks down more easily and more quickly than synthetics, leaving behind sludge and varnish. In turbocharged applications, they can also cause 'coking' in the turbo bearings, which will eventually restrict oil flow and lead to bearing failure.

Synthetics are superior in resisting all these conditions and you'll definitely notice a cleaner engine after 100,000 miles if you were to tear the engine down and compare it to one that's been fed conventional oil all its life. It's said that synthetics will deliver better MPG because they're 'slicker' but I've never witnessed any tangible proof of that. I use it solely for protection against 106 degree Texas summers, and to keep my engine's internals clean.

Used Oil Analyses I've seen on several different car forums & BobIsTheOilGuy.com suggest that Royal Purple doesn't perform as well as Mobil1, & Penzoil Platinum in regard to wear. Boutique oils like Amsoil & Redline group IV oils perform even better than those, but you'll pay $$ for that performance.

[SX5_MD]

Since about 2500-miles I switched out the OEM oil to Pennz Ultra Full-Syn becuase of good experiences with it in my G35 and its performance during track conditions. However, now that I have had it through the 8k-mile mark I feel like ever since we put it in my wife has seen a reduction in mpg performance.

As far as other full-syns go, in the past for other cars I have used Valvoline (when it was good), Amsoil and Shell Rotella-T (a great high performance oil). I have never swallowed the purple pill that is Royal Purple yet, but they seem to be the only full-syn that pushes the added mpg and is praised for it as well in consumer reviews.

So this post was an attempt to see if anyone with Forte 2.4 had any insight on it. I guess it wont hurt to try next oil change come summer time.

As far as the auto-transmission goes, I'm not gonna touch it. I researched a bit and apparently Kia did a lot of R&D with the trans and the fluid appears to be already optimized for mpg savings...not to mention no one makes a clearly lateral replacement for it.

[Walpole5]

Originally Posted by Walpole5

If you are going to switch your manual tranny fluid, go to this:

Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MTL 70W80 GL-4 Gear Oil

I've had it in my car for about 15k miles. It's excellent. It smooths out the shifts, cold weather shifting is eased, and it just makes for easier driving, it's almost Honda slick now. I highly recommend it. Don't go with synthetic. I did and it made the transmission shift worse and the cold weather shifting horrible. Strange, but true.

I have been using Mobil One 5W-20 in my engine for about a year. If there is an improvement in mpg, I haven't seen it.

Just realized you had the auto. Sorry, I assumed an manual when you talked about changing out the fluid to synthetic.