the blur

I just finished using my stock pile of the old formula Mobile 1 oil. When it went out of production I brought 5 cases. All gone....

I know there was all sorts of talk about the new oil missing some special ingredient.

What is the current trend for HPDE motor oil? This is for my LT4.
I'm not looking to start an endless debate, Just want a good full synthetic 15w-50 oil like the old formulation Mobile 1.

Aardwolf

I have 5-30 in mine, I've been considering a 10-40 for the summer heat though. Why a 15-50?

fhturner

As I understand it, the "High Mileage" Mobil1 still has the zinc and other anti-wear additives that we want. I've been buying the High Mileage 10W40, but haven't seen much in the way of 15W50 (HM or regular). If there is such a thing, you may want to try that out. I think the old "code" is 'SL' on the back, and the new stuff only has 'SM' (somebody correct me if that's wrong).

varkwso

I use the 15-50 Mobil One - new and old formula - it depends on how old the stock is at your local Walmart (5 qt jugs there the cheapest I have found).

AU N EGL

15W50 is the only oil that can withstand the repeated high heat of racing or HPDEs

sothpaw2

I've just been using the Mobile syn 10-30. Is 15-50 really the only thing that can protect the motor at HPDE? My bearings won't like me for putting 10-30 in there w/stock tires?

Aardwolf

Getting any low oil pressure? If your oil temp gets up there and oil pressure drops, a heavier weight oil can help. Oil can shear down in weight too. I doubt zinc would be helping the new engines much, it's needed for older flat tappet cam engines. I've been using Shaffer's oil, here is their page they have a few 50 weight oils.

http://www.schaefferoil.com/motor_oils.html

Check Bob is the oil guy site if you want to get in depth on oil!

ZR1 MK

The reduce ZDDP and Phos levels are only in the thinner oils of 10/40 and below. The daily driver oils. The 15/50 and 20/50, for track use, and of course good for the street too, maintained the high levels. This is what each oil company tech dept told me from the variety I called. They will give you the values for each of their oils if you call them.

For reference, Red Line is the best oil. All the main stream synthetics are a notch or two lower and on pare with each other. Small differences between each main stream brand that wont affect you.

Oil temps is what seems to be the problem with most here causing parts fatigue from excess heat. None will protect from that.

ZDDP is critical for solid lifters, as failure will occur without the proper levels of approx 1200. But its still important to any car driven hard at the track.

The down side to higher levels is reduced cat life. Ill take the reduced cat life and longer engine life.

Allthrottleandsomebottle

's........... 15w-50 in all mine as I am tough on them all the time

Kanmer

Too bad for you they don't make it for trannys!!! Oh wait, they do. Get back to work slacker!

AU N EGL

Steve You are not TOUGHT on them ALL THE TIME. Just when you drive that is

AU N EGL

Red Line makes a great straight 40wt racing oil. That is an other great option.

Amsoil also has a racing wt oil.


I just got something from Shell about the Quaker State 15-w50 racing oil sold at Jeggs.

WBHighwind

So I just got done with a full HPDE week end. Last week I replaced my oil as usual in preparation and I just put 5-30 Mobil 1 in like I thought everyone else did. Should I switch over next time to something heavier? I was only seeing oil temps around 230 since I have an oil cooler. I wasnt watching oil press even though I probably should.

Aardwolf

Mine has only been running a 230° oil temp too and hasn't shown oil pressure loss. If you have video try pointing the cam at your oil pressure for a session.

John Shiels

you are replacing your oil at every event? How many miles between changes?

BQuicksilver

Does anyone use the Mobil 10w-40 regular? I'm thinking about switching to that this year for mixed track/street duty.

Allthrottleandsomebottle

Your one to talk........

WBHighwind

Well Ive only done 3 events so far this year and I do drive it on the street in between. I usually see the oil life indicator on the dic get down around 50%. I know I did ~300 track miles this week end and I wont be doing another event for another month or two which will give me enough time to maybe drive the thing another 500 miles.

John Shiels

I have done some oil testing and DIC is very accurate. Testing in my car with my temps shows I can go 2500 track only miles on 10/30 Mobil 1. It may differ depending on how much you add between changes and your temperatures your vehicle sees. I am now using 15/50 Mobil 1

C66 Racing

The "special ingredient" is ZDDP, or Zinc dialkyl dithio phosphate, the primary anti-wear additive in oils. The new API SM specification limits phosphorus to 0.08% or 800ppm in 30 grade oils, which effectively limits the amount of ZDDP the oil can have.

Mobil 1 put this table on their website recently which shows the phosphorus levels in their oils:
http://www.mobiloil.com/USA-English/...duct_Guide.pdf

For those looking for high ZDDP oils (noting that none of these meet GM Standard 4178M), AMSOIL makes these oils which all have zinc on the order of 1275 ppm, and phosphorus on the order of 1365 ppm.
AMSOIL Series 2000 20w50
AMSOIL SAE Synthetic High Performance 20w50
AMSOIL SAE Synthetic High Performance 10w40
AMSOIL Series 3000 Synthetic 5w30 Heavy Duty Diesel Oil

The other aspect to consider is the oils temp and its impact on viscosity. As oil temp goes up, viscosity goes down... a lot. A typical 5w30 has a cSt viscosity of about 55-60 at 100F, 10-11 cSt at 212F, and 3-3.5 cSt at 300F. So, at 300F (which isn't uncommon in track driven cars without oil coolers) that 5w30 only has about 30% of the viscosity that it had at a street normal 212F. Thus, I feel the grade chosen should take into account the oil temp seen on the track. The last season I raced (been a while now as sea duty and my accident in 2006 have kept me sidelined), I used the 10w40 listed above. In the dead summer in Memphis, I was using the Series 2000 20w50.