do not have time to search at work but needed to know if anyone is running royal purple if so what weight and how much is needed? I usually take to dealer but had issues last time so going to start doing it myself. I am running royal purple in the rear and am working on switching all the fluids over. car is 98 formula thanks.

 

I run Royal Purple also, they make great products. I'd run their 5W-30 for the motor( I believe it takes 5.5 quarts) its probley pretty cold up in indianapolis so the 10W-30s viscosity is probley just a tade to think for the cold weather and start ups, im not 100% sure on the 10W-30 as i live in texas and it don't get that cold like up there. If ur formulas a manual id put Royal Purples Syncromax in it or an ATF, either one works fine. I went with the Syncromax, (4 quarts for a manual). If its an automatic they make a ATF fluid thats for Auto's. (Not sure how much for the Automatics its in ur service manual- should be under capacities or specifications).

 

I run royal puple 5w30 and I'm an a4

 

Correct me if I'm wrong but 5w-30 and 10w-30 are the same weight oil just the 10w is thicker on start up.

 

^ Pretty much. 5w-30 is the recommended oil for our cars if you look in the manual. It just says that you can use 10w-30 for weather above freezing, but 5w-30 is still recommended.

 

I used to use it but I have officially switched to Amsoil. I like RP and have nothing bad to say about it.

 

5w-30 is recommended mostly because of EPA gains. 5w-30 will very very slightly give you higher fuel economy (less thick=less resistance), but 10w-30 will give you more protection as the oil is in your engine longer (certain oil additives do wear down as the oil is sheared/compressed, etc). Once again tho, the differences are very small. I run 10w-30 in my oldsmobile even when it gets to freezing, doesnt cause a problem, but i run 5w-30 once i change my oil when it gets to October/November just to be safe on those 10 degree days

 

I use 5.5 quarts of 10-30... btw royal purple is some badass **** imo..

 

I'm not nocking RP or Amsoil, They are great products, this is just info to help you make a better decision.

API rates the quality of oils for wear protection etc. The state of the art right now for wear protection is API-SM for automotive oils. The S signifies a gasoline engine and the second letter is the level. The further down the alphabet the better. Conventional oils typically don't go past L and the better synthetics should be rated M. API rated oils will have the round seal from the Society of Automotive Engineers (SAE).

Some of your all out racing oils are not API rated, this does not mean they are not great oils, just that they are not tested to meet API standards. You don't need a lot of high milleage protection for a nitro motor that gets an oil change every 1/2 mile.

On a street motor, you're not going to get a whole lot more protection from one SM rated oil to the next, but prices vary drastically.

 

why is it badass? because the bottle is purple and it looks cool?

 

LOL^^^ Btw the thinner the better on start up and if you going to spend that kind of money on oil don't waste it on RP and their marketing BS. Buy German Castrol which has been a proven performer for our cars.

 

exactly !

 

there manual trans fluid is great in the T-56 transmissions

 

nice one smart ***, have you ever used it before... Because i have used it since the car had 30xxx miles on it and, tore the engine down it was so clean no ware. I was just very happy with it. Also It always felt like it ran a little bit better then other oils.

 

Alot of mixed reviews on royal purple...by there advertising you would think its the god of oils.... when u have time try a search here. Bobtheoilguy.com also has alot of good info aswell

 

I use pennz,castrol...As long as its a good brand and change frequently thats whats important..Now every now and then my buddy will get a good deal on RP and when I change my oil I get it through him..But other than that I'm not super particular other than changing it frequently

 

That might be a good idea, Castrol Syntec is SM rated.

RP 5w30 and 10w30 are both SL rated

 

I run Amsoil for both

Motor Oil: http://www.amsoil.com/comparison/motor-oil.aspx

And Gear lube: http://www.amsoil.com/lit/g2457.pdf (worth a good read!)

 

LOL the motor oil comparison is hilarious. I'm sorry if you based your decision on that.

Why didn't they compare synthetics vs synthetics? Because they wouldn't have been the hands down leader if they did. Amsoil synthetic just barely beat conventional castrol in wear protection.

 

Haven't used RP Motor Oil, but have used RP Synthetic ATF and 75w90 Gear Oil, both of which were pretty good.