Oil Test

[Twice Bitten]

As Tested February, 2002



You don't think that they could of improved since then????

There wouldn't be any marketing on your part, , would there?

Ask Joe J about his engine when they tore it down? His part failure had nothing to do with oil.
IMHO, you are not gonna go wrong with most of these products.

[jimmysidecarr]

If you are going to run extended drain intervals, then Amsoil is tough to beat... Seriously... It really is THAT GOOD!

But if you are going to change it once a year or more whether it needs it or not(like I do) Then Royal Purple just cannot be ignored. It is an outstanding protector of expensive engines, with an ever growing base of users, both grassroots and high end 30K race engine guys.
Yet it is also very reasonably priced IMHO for what you get.
Anyone with a Canton road race pan(or equal) will know value is also a big deal.(almost 9 quarts)

I had been using it in the 89 squire wagon(engine,auto trans, and diff)(7 years) and the 99 32V DOHC Navigator(engine and diff)(5 years) but with my recent spending binges they both now use Motorcraft Synth blend 5w30 to save a little brake pad money.

In the 04 Cobra it's in the engine, trans and diff. This car sees no mercy so I feel it is a very good idea to protect it the best I can... without breaking the bank too bad.
The trans appears to be a one shot deal since there has been no degradation in shift quality since the initial improvements from the RP Syncromax install 2 years ago.

The diff has no cooler and has been upgraded to a gear type, clutch-less, torque sensing Detroit TrueTrac which I would like to last a good long time... so... RP MaxGear 75W140 is what I use in it... It usually gets changed once a year because of the no cooler thing.

I wish I could get deals or a kick back or something from Jarid.... LOL.. but no dice... I buy everything from O'Reilly Auto Parts at the normal price.

I'm pretty confident that it's protected as well as it can be.. on my budget.

The extra horsepower is just a bonus... not the prime motivator.

[Levi]

Would like to change the engine oil on the Shelby and Ford recommends on the 5.4 to use 5W-50 Motorcraft full synthetic motor oil. I see everyone talking about the weight of motor oil. If I go with RP, what weight do you think I could use and where can I get some?

Jimmy can you hook me up with some oil filters?

[97CasperCobra]

Originally Posted by Levi

If I go with RP, what weight do you think I could use and where can I get some?

NAPA carries RP....and I've seen it at the new Wal-Mart they just built in the Woodlands...think it was only 5W30

[Exige]

ProAm on Richmond carries Royal Purple in quite a few different weights, they will order it for you if they dont have the weight your looking for. Picked up a case last time I was there for a little less than $100.

My car holds around 8-9 quarts of oil, but I generally only change 6. You really cant get all the oil out of the oil coolers since they are in the front of the car and the engine is in the back.

[jimmysidecarr]

I'm not seeing availability of a 5w50 RP oil, only a 20w50.

I would probably stay with the Motorcraft Full Synth until availability improves with other full synth suppiers in your specified weight.

It's a lash adjuster thing, due to the port roof being raised. They had to also shorten the lash adjuster which changed it's bleed down characteristics forcing the use of the heavier oil. At least that is my understanding.

I'm sending a PM with pricing.

[Twice Bitten]

10w-30 RP,
TV Ford probably has the best price in town.

[jimmysidecarr]

Originally Posted by Twice Bitten

10w-30 RP,
TV Ford probably has the best price in town.

Larry are you using the 10w30 RP in the GT?
If so, are there no issues with the lash adjusters bleeding down too fast, that you know of?
Probably would never see or hear a difference, but I've heard that it will dyno lower due to less lift and duration.

I'm using the 10w40 race version RP in my Cobra and not 5W20, I was using the RP 10W30 street.

[Twice Bitten]

Yes, that is what I am going to use the next time I change the oil. I can give up a little HP that can only be measured on an engine dyno for better overall engine lubrication. Did notice a difference when you drove it???

[jimmysidecarr]

Originally Posted by Twice Bitten

Yes, that is what I am going to use the next time I change the oil. I can give up a little HP that can only be measured on an engine dyno for better overall engine lubrication. Did notice a difference when you drove it???

LOL!

Let's see.... I think we had to be rolling 3rd gear about 70 before it STARTED TO HOOK!

The race version oils have slightly different viscosity availabilty, but the RP race oil is more money than the 10% over cost Motorcraft.

You guys know what I like and run but I only change it about once a year.