so i have been recommended the valvoline VR1 SAE40 race oil by a few people but i know on my c5 cap it says mobile 1 5w 30 I dont drive the car much and i have basic bolt ons with a tune... what oil should i go with? please let me know whats worked the best.....

 

Do NOT put 40 weight in!!! Slap the person that said that, run 5w-30 or if you live in the south you can run 10w-30 but I run 5w-30 Amsoil year round. Mobil 1 is fine too.

Clearances are tight on the LS1 and running 40 weight would decrease engine life due to it taking longer for the oil to circulate on a cold start-up (and a warm one for that matter)

 

I use 10W30 Mobil1...

 

I use 5W30 Mobil 1

 

Castrol edge 5w-30.

http://www.castrol.com/castrol/secti...tentId=7050795


777

 

Go with what it says on the oil cap...............Duhhhh

And if for some reason you don't like mobile One, then put someone's else 5-30 or 0-30 synthetic in. This is not rocket science.................

 

Me too.

 

Straight 40??? That mud is like aunt jemima syrup. Keep that crap out of your car unless you enjoy repairing a seized engine.
Mobil 1 5W30 synthetic ONLY!!!!!!!

 

If you're not racing the car then use the recommended Mobil1 5W-30

I use Mobil1 15W-50 at the track, but remove it when using the car normally and replace it with 5W-30

 

The Manual says if you run your car at 0 deg or lower use 5w-30, if you are staying ABOVE 0 deg use 10W -30. I'll bet 90% of the people using 5w-30 never see anything close to 0 deg. but by god that's what the fricking cap says! I have a Lingenfelter that is not force inducted, just a cam, valves etc. and they recommend 15w-50, I store mine all winter so the coldest I run it is probably 55 deg. I go with what Lingenfelter says, plus I like that maple smell when I pour it in Mrs. Butterworth's 15-50 racing syrup is used by all the pro's

 

You will lose horsepower using 15-50.


You are wrong, the corvette racing doesn't use 15-50; that's not what the pro's use, per Mobil Oil, they use 0w-50.



"You say that Mobil 1 Racing oils are not for street use. Why is that? Does that mean I can't use these oils if my race car is also my daily driver?

Automotive street use oils that meet the latest industry standards are required to have a lower level of Zinc and Phosphorus anti-wear chemistries than oils formulated years ago. The latest automotive street use engine oils are designed to be compatible with emission control equipment. Mobil 1 Racing oils are formulated with anti-wear (Zinc/Phosphorus) chemistries at twice the level of automotive street oils to provide enhanced protection of highly loaded valve train systems found in some race engines. Based on the high level of anti-wear chemistries, Mobil 1 Racing oils are not recommended for street use.


Oil Viscosity and Horsepower
Viscosity is the thickness or weight of an oil. The viscosity of oil in your engine will affect horsepower or power output tremendously. Using a high viscosity oil actually puts a load on the engine because the oil pump is working harder to pump oil through the engine. A thicker oil will not necessarily improve boundary lubrication either. Boundary lubrication is the oil film on a surface. If oil temperatures are consistanly high or bearing clearances are excessive, then a higher viscosity oil may help because thicker oil will take up some space within the journal and bearings. And oil shear is less likely at higher temperatures with a higher viscosity oil. Oil shear is the point at which the oil begins to breakdown.

Thinner oil viscosity allows the engine to produce more horsepower or maintain engine specs because the oil pump is not working as hard and rotational drag is decreased.

Some people actually run their engines with the dipstick level lower than normal full or at the low mark, to increase horsepower. Although this actually does work to increase horsepower it is not recommended because some oil is burned off at high RPM and can cause starvation when taking corners. A truckmount is stationary so starvation is less likely unless levels fall too low.

Overfilling the crankcase with oil is actually worse than not enough or low oil. When the oil level is too high, aeration takes place. This is when the crankshaft whips up the oil to a foam and makes it difficult to pump oil and also starve the motor of oil. Hydraulic lifters are notorious for leaking down when aeration takes place and levels are high. When a hydraulic lifter leaks down you will hear a loud chattering sound coming from the engine at high rpm. This has happened to me a couple of times. Kill your ignition immediately when this happens because dropping RPM does not help.


777

 

You are wrong, the corvette racing doesn't use 15-50; that's not what the pro's use, per Mobil Oil, they use 0w-50.

Where did I say this?

"You say that Mobil 1 Racing oils are not for street use. Why is that? Does that mean I can't use these oils if my race car is also my daily driver?
Where did I say this? I think you are trying to put words in my mouth.
All I'm saying is Lingenfelter says use 15-50 and they did the work to the engine and WARANTYS IT. I think 5w-30 is too thin to run in the summer months, will it harm your engine...doubtful but you will have more oil pressure with the 10-30. Running thinner oil might get me an extra pony or two but my 443 RWHP with the thick stuff is good enough for me.

 

ok well i think i know what oil not to get haha..... so even if i go with 5w-30 then is not a good idea to put Lucas in there with it?

 

Jim in Mich,,,,,,,,,,what you said is "....15-50 racing syrup is used by all the pro's "

Mobil oil is the "Official Lubricant of Corvette Racing," and they don't use 15-50 for racing oil.

see:

http://www.mobiloil.com/USA-English/...Qs.aspx#FAQs14

This says, Mobil does not recommend you use racing oil for a daily driver.

The OP is just looking for recommendations for engine oil in his stockish corvette ;
I am sure all of the name brand synthetics will work for him.

If your engine builder recommends 15-50 I would go by what he says, for your motor.

I have a 400 HP n/a car with 100 shot. I use 5w-30 and it works fine for me. You use 15-50 and that works for you. There is several considerations to take into account
when determining engine oil and they are all different. No one size fits all.


777

 

the only difference is that my preference is castrol edge at the mfgr's 5-30 recommended specs.

 

oh god....where is evil twin

 

What I said was Mrs Buttersworth's Racing Syrup 15w-50 (as in maple syrup) I was trying to make a funny but you took it literally. If you like running 5w oil, which is what it is when it gets to operating temp, go for it. I think the 10w-30 would be a better choice in the summer months, kinda what your owners manual says. No hard feelings it's just MY opinon.

 

Mobil 1 is perfect to use, recommended by GM and easily available at any Walmart too

Thanks,Matt

 

No problem J I M.

777

 

Doesn't any of these newbies read their owners manual? Or, when they buy the car, it doesnt have the owners manual. Which is really a sad commentery about the former owner. I have a journel with every thing that I have ever done to my car.. including receipts and correspondance. every sales slip,test result for every drop of oil and filter, light bulb, mod, every maintenance scheduled report.



"so i have been recommended the valvoline VR1 SAE40 race oil by a few people "
"It was recommended by several people??" Do you always hang around and listen to people who know nothing about automotive technology when it applies to your car? Several usually means more than just one person. You should stop listening to the recommendations of people who are clueless about a C5. We made that owners manual so simple, a cave man could follow it, yet, so many people have to ask and post recommendations by people who know nothing about this car.