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I stay away from the Mobile One-it just doesn't seem the same since they reformulated it. Honestly I use what is cheapest or on sale in a 10w30 grade-as I change it out as soon as I see the colour turn from gold to dark. The FI cars with the breathers, rich tunes and meth tend to be hard on oils-changing the oil often is just cheap insurance!
Location: ECS : WTF did you break now and HTF did you break it this time
I run 15w50 mobil 1 in the vettes (both the NA 427 road racer and the forged 346 paxton car) i bought out the local straus auto when they had 5 qt jugs on clearance for 15 bucks. The girl looked at me like I was nuts when I walked up with about 15-20 jugs. She said, this is for private people not shops, I said honey I'm not a shop I'm worse I'm a racer...Her face when I started loading it all into the vette was priceless.
run 5w30 mobil 1 in the supercharged 07 suburban tow rig too. I've been told 5 or 10w30 on stock motors, and with all the built motors from ECS Ive been told dino on break-in and synthetic 15w50 after. The guys never seemed particular on what went in it.
Heck at teh track one time we swapped oil and I think it wound up being half mobil half amsoil.
but clean mixed oil was better than beat to hell cooked oil.
realistically walking into the store I'd go with anything name brand heavy weight and synthetic. any clean oil is better than what was in there.
I've been using Royal Purple 5w-30 motor oil in the Z06 since I got it. I also send out samples to Blackstone labs on a pretty regular basis. Just changed the oil this past weekend to 5w30 RP full synthetic, sample should be going out this week.
some of you running 15-50 oils, its been so long that I forget what the different numbers mean it terms of viscosity when hot & cold. anyone care to refresh my memory?
I've been using Royal Purple 5w-30 motor oil in the Z06 since I got it. I also send out samples to Blackstone labs on a pretty regular basis. Just changed the oil this past weekend to 5w30 RP full synthetic, sample should be going out this week.
some of you running 15-50 oils, its been so long that I forget what the different numbers mean it terms of viscosity when hot & cold. anyone care to refresh my memory?
A 5w-30 oil starts like it is a 5 weight and the "w" stands for winter. When hot, it is a 30 weight oil. So a 15w-50 starts like a 15 and runs hot like a 50. GM recommends a 5w-30 in just about everything they sell because it is a universal oil and works well in motors with tight clearances. A 50 weight oil may not work well in a motor with tight clearances, rather it works well in a motor with "loose" bearing clearances. Loose bearing clearances make more power in a race engine. You wont necessarily get better protection with a thicker (50) oil if your motor is set up with tight clearances, and you may actually lose power with the thicker oil.
The Mobil 1 15w50 has almost 50% more anti-wear additive than the 5W30.. 1200ppm vs 800ppm. All of the "recommended" weights have to meet new emission standards and have lower PPM of the Zinc Phosphate(anti wear additive) in them...
Quote:
The active ingredient that you are talking about is phosphorus which is added thru a component called ZDDP. For products that meet the new ILSAC GF-4 specification the phosphorus levels for the oil must be less than 800 ppm phosphorus. The ILSAC level for phosphorus has been reduced to protect the catalytic converter and other emission protection equipment. The engine manufacturers are confident that this level of phosphorus will protect both new and older engines. However, there are Mobil 1 products which have a higher level of phosphorus (phos) and can be used in engines in racing or high performance applications; see the attached table.
What is the Best oil for high horsepower supercharged motors?
Thanks
In this application, I would run an oil that has a high HTHS rating and high levels of ZDDP anti-wear additives (and as mentioned above new API SM/ILSAC GF-4 30 grade oils are limited to 800 ppm). As most of the oils on the market having both high HTHS rating and high ZDDP are 40 or 50 grade oils, I'd also be very easy on the throttle until the oil is warmed up. My personal guide is to not get on the throttle in either of my cars (02 Z06 and 06 CTS-V neither of which is supercharged) until the oil is at least 150F.
I personally believe the High Temp High Shear rating of an oil is a good indicator of how the oil will perform in the engine, particularly for those running the car hard. The High Temperature/High Shear Test measures a lubricant’s viscosity under severe high temperature and shear conditions that are similar to severe service applications in an engine. The below HTHS ratings were pulled straight of the corporate websites of the various companies.
Corvette Store
Best Syn. Oil for Supercharged Motors
I've been using RP 10w30 for 2 years.
