What do you guys prefer if either. I want to get away from the regular 5w30. I was thinking either Mobile1 or Royal purple for engine and also transmission.

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=DOHNER=
SILVER 2002 GT

Royal Purple

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

You notice a difference over the regular oils. What weight you running.

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=DOHNER=
SILVER 2002 GT

Yep.

5w-30

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

Sweet. anybody else have any input.

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=DOHNER=
SILVER 2002 GT

Royal Purple makes fantastic products in my opinion. I ran the gear lube in my Grand Cherokee with fantastic results. The ONLY reason I won't use their engine oil and run Mobile instead is the color. It is purple obviously and appears dark to me even when it's new. I think it is just hard to visually inpect the condition of your oil. I change mine regularly, so it probably would never be a problem, but I do take a look at it quite often.

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Master Certified Auto Glass Technician
Kansas City Pontiac Motorsports Club
Green Bastard Products
My F-Quick Garage
My GPF Garage

It's impossible to visually inspect your oil anyway. Oil becomes worn due to the shear of the molecules. The color only reflects that your oil is absorbing and cleaning out carbon, which is its job. You can't see the state of the molecules, so the color tells you nothing.

The purple die wears off in about the same time any oil will turn dark anyway.

The positive effects I've seen are longer warm ups (yes, t-stat is new) due to less friction. Also seen higher fuel economy on the highway.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

Exactly right. The only way to truly tell the condition of your oil and oil filtration is with oil analysis. You can get a go/no go type reading using specialized test paper but for a true reading, oil analysis is the only way to go.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!

I know allot of people around me that swear by AMSOIL. Here is some data to back up the quality, the research was on the AMSOIL website so im sure any unfavorable results wouldn't be included so their is most likely a bias.

Comparative motor oil testing link.


Actually this looks like the same report done by the American Society for Testing and Materials (ASTM).

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1999 GTP (70k miles): Thrasher CAI, MSD ignition coils, pcm. Soon: 3.5" Quickchange pulley, alcohol injection, autolite 104's, 180* thermostat.

As a dealer, one of my favorite things about Amsoil was their willingness to publish not only the test data but also the results in which they did not come out on top. I have always challenged anyone that asked to go to Amsoils website and look at their products and read the Typical Physical Properties, then go to a competitor such as Mobil 1, Castrol, Royal Purple, Red Line, Vavoline, etc and try and find the same exact information. You will find that it is nearly impossible and makes it very difficult to make an apples to apples comparison.

It is refreshing to see that they are and always have been that open about their test results. Ive been selling their products for over 12 years now and never have I been really disappointed in any of their products.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!