c didy

Good luck getting some people to understand that. Especially if their vehicle is a pickup truck. Just seems to rub them the wrong way. Remote car starters are their dream come true.

silver_tt

They can keep using their remote starters but I would say to them that it's always good to think about WHY you are doing something and what the consequences are. On cold start what is the ECU telling the engine to do? It's telling it to run very rich and the injectors are dumping fuel into the combustion chamber. This is the reason when I start the car in the winter in the garage my daughter always says "ewwwww". Even a 9 year old can smell it's running rich........ If I just have to go up the street and back, I just walk or ride my bicycle.

GC996

I live in a cold weather state. It's amazing how fast the heater warms up and the cabin gets plenty hot real quick in the 996.

I do the same start up procedures with my Audis. After all, they are German cars following the same environmental manufacturing constraints and therefore issues.

KJinDC

Resucitating this thread in the hopes of confirming that FR50 is just the 50 weight version of DT40? As my car is 98% track only, I assume that would be the preferred oil since it is spending a lot of time at high revs and in the mid-summer heat and humidity of the Mid-Atlantic. I recall another recent thread where the engine builder (Strakker?) was advocating for 50 weight oils in their engines. Apologies if this has been discussed before and please direct me to those discussions if possible. Thanks all.

plpete84

Essentially, yes. I have been using FR50 which is 5w50 since 2021 in my car and have been very happy with it. I switched from DT40 to improve oil pressure, which FR50 did. I have very limited track experience but have also used FR50 during a track day and had 0 issues. I know Driven also makes a track specific oil that is 50 weight if you want to go that route. Below is my UOA showing a very healthy viscosity ad oxidation values. Brandon from Slakker and guys at Hartech recommend 50 weight oil for their engines but as you can see I have been successfully using it in my stock M96. The weight is not an issue where we live.

GC996

FWIW, I just talked with Lake Speed yesterday about DI50 as an alternative to DI40 for more oil pressure stability on the track. As the original video suggests, Lake is a fan of using DI40 in our M96 engines for both street and track. He suggested that DI50 is an option as well if you want a heavier weight for the track.

He cautioned on mixing different oils when changing from street to track oils, but changing from DI50 on the track to DI40 for the street is not a problem due to composition.

He also mentioned that the DI oils can handle track temps extremely well and that DI40 has become very popular as such.

Importantly, to be clear, Lake knows that my car is not a dedicated race car. Instead it is a street legal car that does double duty for DE events.

I plan on testing virgin DI50 and posting it on this thread in comparison to DI40 and Millers Nano 5w40 I already posted earlier in this thread.

KJinDC

Thanks Pete & GC! I've been using Mobil-1 15-50 for a decade or more now. I switched when i noticed my oil pressure gauge barely getting to 4 Bar over a 20-30 minute track session in the summer. The 15-50 did improve the gauge somewhat. My oil gets changed after every 2 events. When the motor was proactively rebuilt I had some minor bore scoring but I expected much worse considering the life the car has lived. Anyway, on the rebuilt motor, I trying to decide which Driven oil to use. So, FR50 vs DI50 vs DT40? I guess I can't really go terribly wrong whatever direction I chose.

silver_tt

If this is a 98% track car and you are changing your oil every 2 events, you could consider XP6 or XP9 which would be the best. The only downside is that you need to drain it after each event, it's not an oil that you can let sit in the engine for weeks on end like a street oil.

Porschetech3

From the data I have seen from extensive track testing the M96 with AIM data acquisition equipment, the only reason you would want to use a 40 weight oil on the m96 is for gas mileage on a street driven car that is never Tracked...

The 50 weight is much much better for everything ( except gas mileage), it gives more protection at very high oil temps, and it leaves more oil in the oil sump to keep from oil starvation, and can even be used in cold weather down to below freezing...( 0*F)

plpete84

What Skip said. Oil is just one of those things where you might get as many opinions as people you talked to. I do believe that the 50 weight oil is a very good happy medium, especially if you track or drive your car hard. We have seen that heat is the enemy here and a lot of data has been thrown around showing that as oil gets hot, viscosity tends to suffer. It's always a good idea to talk to the person that built your motor, if possible to see if there are any recommendations there too.

GC996

One of the points that Lake made to me yesterday was to make sure if you are running two different oils for the street and track, make sure they will work together. As an example DI50 for the track amd then DI40 for the street and cold weather months works. I didn't think to ask what the XPs worked with in the Driven line.

While DI40 is now being used on the track by many, myself included, I have not heard yet about DI50 being mainstream. However, using 50 oil on the track to boost oil pressure is now a hot discussion topic, so we will probably start to hear about DI50 more. I am most likely going to give it a shot in April.

KJinDC

Thanks! Unfortunately for me the car sits in between events, sometimes up to a month at a time. I'll look further into this oil option if I can line up a series of HPDEs and races almost back-to-back. I do prefer to stick with one brand of oil though and not change between street and track.

Porschetech3

Also if you are switching oils from a 40 to a 50 not only do they need to be compatible ( chemical additive wise), but there is also about 1.5 qts oil that will not be drained, so if going from a 40-to a 50, the end result will be ~ a "48 weight" and when going from a 50 to a 40 it will be ~ a "42 weight"....so only a 6 point difference instead of a 10 point difference...

Tha'ts why I just stay with a 50 weight, I'm not crazy about switching weights when a 50 will be good down to 0*F, and I will never see -40* below 0*F ..lol

silver_tt

Should be no problem switching between XP and DI lines.

GC996

I hear you. That what I have historically done with Millers Nano then DI40. Always changed the oil after a track day to fresh oil and it has worked well.

But to Skip's point, I never start nor drive my 996 when it's below 40 degrees anyways so maybe it's time to just go 50 all the way.