Z06Fix

I had always run Mobil 1 10W30 in my cobra for track and street. I have been using it in the vette also. Is there any need to goto a thicker oil for track use? I was a little worried about it thinking that the engine tolerences are set up for a 30 weight. I didn't know if 20W50 mobil would be a good thing to try or not.

Thanks,

Eric

ghoffman

I use Royal Purple #21 racing which is like 5-30, all year long.

AU N EGL

20-w50 is too heavy

I use M1 15-w50 but I dont drive my car on the street

0-w40 is popular

M1 makes a 5-w50 but hard to find in the US

Lots of guys use the Red Line 40 wt racing oil

I am looking at the new Joe Gibbs Racing Oils which is designed for racing and high heat track use.

spazegun2213

M1 10w-30

Although i might switch to 15w-50 or 10w-40 later, but thus far 10-30 has been doing great.

Bill Dearborn

I use M1 5-30 or 10-30. Usually the 5-30 but if there isn't any on the shelf I will use the 10-30. Since I only put about 4K miles per year on the car I only change the oil once per year which with all the track time gets me down to about 40% oil life remaining when I change the oil.

Bill

Z06Fix

Sorry guys I ment to type mobil 15w-50. I work at a bike shop and we use 20w-50 alot in V-twins. Guess it just kind of sticks after awhile.

Thanks for the input.

RedLS6

5W-30 becomes a little too thin for my comfort level with oil temps above 260 degrees. I began using Mobil 15W-50 several years ago to maintain desired viscosity at these elevated temperatures. However, it is a little thick for street driving at lower oil temps, and is noticeable on cold days.

A couple of years ago, I switched to Mobil 0W-40. I noticed a drop in oil temperatures (average 7-8 degrees), which I believe is due to the lower viscosity and resulting lower shear work in the oil. 0W-40 is thinner at startup than is 5W-30.

For the past 18 months, I've been using a 50/50 blend of 0W-40 and 15-W50. Works well - it is only slightly thicker than 5W-30 at startup, but is almost as thick as 15W-50 at the higher racetrack temps.

.

sothpaw2

15-50 a little thick for street driving--what if I only street drive in the summer? The street driving issue is just that below say 40 F the oil is too thick and might hurt the motor on start-up???

varkwso

it is unlikely to matter since the min temps are -25 for 5W and -15 for 15W

rustyguns

how much a quart for joe gibbs vs M1 ?

Gray Ghost GS

I'm experimenting with oil weights and brands - I've been using Royal Purple 5W40 year round and am now trying Mobil 1 0W40 during track season. Watching oil pressure, temperatures, etc. I'm thinking of trying Redline or Amsoil 10W40 next. Mike

Follow up from VIR: NOT impressed with the Mobil 1 0W40!! Lower oil pressure after running a full hot session than what I had with the Royal Purple 5W40 - now reading low 20s vs. high 30s at idle after a 30 minute session. I'm placing an order for Amsoil 10W40.

Solo2GS

I ran 15w-50 once in my LS6. A bit too thick for the tiny oil passage IMO. Most of the time it would just peg the oil pressure gauge. I just run M1 5w-30 in it.

The LT4 runs on 15w-50 on the street or the track...

As with both of them you just have to let it get above 100F before you do any hard driving.

BQuicksilver

http://forums.corvetteforum.com/show....php?t=2008738

http://forums.corvetteforum.com/show....php?t=1790808

http://forums.corvetteforum.com/show....php?t=1707174

ghoffman

I had a long talk with the JGR guys at PRI about their oil and I have not tried it yet, but I was impressed. It certainly seems to be working for their Cup, Nationwise, and Craftsman trucks this year! Zippy sure was convincing!

RedLS6

I've "heard" that the thicker oil is worse for startup.......but I don't know for sure, as all I have heard is theory and conclusions based on very old tests, not backed up by any newer real world tests using this specific oil in our engines.

On cold days, my oil pressure was very high with 15W-50, especially with the motor revved up a little. I also have an external oil cooler, so it takes my oil a little longer to warm up on cold days. On warm summer days, I was pretty comfortable with the 15W-50.

ipuig

If you review the product data sheets for the Mobil 1 5W30 you will note that the 5W30 product has a higher viscosity number @ 100 deg C than the 10W30 product.

Drug Delivery

I noticed my oil pressure is up 2-3 psi running the 15w50, and that's on a cold start. Once at normal operating temperature, its the same as the 10w30.

96CollectorSport

Just a little FYI on the Joe Gibbs Racing Oils, it is for racing ONLY!!!
Don't try running it on your street cars it will clog up your cats, the phosphorus in the racing oil is not friendly to cats or 02 sensors, and the extra zinc isn't going to help your emissions test. Also they recommend changing the oil after 500 miles (which probably isn't a bad idea for track use only.)
I just thought I'd mention it before someone tried it on there street cars and had a problem.

It's probably worth the extra protection on track only cars, also if you are looking into the JGR oils the XP3 is what they would recommend for our cars (similar to a 10w30).

sothpaw2

What do you guys think of mixing 15W-50 2qts with 4qts 10W-40 to get something safe for cold starts down to 40 F (Octoberish!!!) but decent protection at the track? I liked your idea of mixing. I do drive mine on the street and on an October evening I bet it could be 40 F when I leave from work.

sperkins

Where from?