BucketList

^^^ True. However, I use Liquimoly and team it up with Ceratec and have excellent OUA's so far. The driven is better oil for sure but it's also pricey. I just moved to a new home and plan to get a lift setup so eventually I will do my own oil changes. Maybe then I will switch to Driven DI40.

wjk_glynn

I'm a lazy-****, and gave up updating it. But if someone has the energy...

The following/attached was the last version I made from September 2020 ("2020.09.29A"):



If anyone wants to take it over, go for it (see attached).

Karl.

Petza914

Where's the Rennlist 😢 emoji.

carguy999

Ohh I see, you're tracking Rennlist members? I'm just gonna use it for myself --- BUT I didn't realize that Blackstone kind of does that for you, in that their reports just tack on the latest change every time. Or at least I think they do?

Petza914

Yes, the first column is the latest analysis with your previous reports in subsequent columns so you can track changes on your engine or differences in mileage intervals or oils.

Then they also provide in the grey column universal averages for that engine type so you can compare yours to others.

silver_tt

The information I posted that GP-1 is for the air cooled engines is not completely correct, you can run it in water cooled engines too. It wouldn't be a terrible track oil but but the XP9 is still going to be the best track oil for sure -- this is an endurance racing oil and what you want to use if you are going to use a track oil otherwise I would just stick with DI40. GP-1 is a good oil overall but is more for drag-racing per Driven and does not need to be drained immediately after a track weekend.

Petza914

When I replaced an engine in my supercharged 928, the one I installed had been sitting a while and had a stuck lifter. I did the SeaFoam in the oil trick to try and free it and clean up any residual gunk inside the motor from the previous owner of it not running synthetic oils. I used the GP-1 because I wanted a less expensive oil for these 200 mile runs with the SeaFoam but one that was compatible with the DT50 I'd be switching to afterwards. I had some leftover once the lifter got freed up so actually ran it for a full service interval and it did really well in the UOA.

If I didn't have a bunch of DT50 for my older 914, 928s, and 944, I would have zero qualms about running GP-1 in those types of engines based on what I've seen from it.

I don't think 15/40 is a good weight for a 997 motor though. I'd use in in your lawnmower or other engines you have around and use something more appropriate in the 997 like a 0w40, 5w40, or 5w50.

silver_tt

Yes, I agree with you. I always thought of GP-1 as an oil for the air cooled engines until today when I was talking to Driven and they advised it can be run it in the water cooled engines as well. I was sort of surprised by this and don't fully understand that position. I also don't think I would want to run a 15W SAE grade cold viscosity in one of these engines or most modern engines. I would be concerned that it won't flow well enough on cold start and could cause damage. Might have to disagree with Driven on this one.......

Petza914

Also agree about that cold viscosity rating. For older water cooled engines like the 944 and 928 that spec a 15/50.or 20/50 it's a solid choice.

silver_tt

Actually you raise a really good point -- maybe he thought I was talking about older water cooled engines? I am still confused since we were talking about XP9 and DI40 when it came up. You are right though, I think it's a great choice for an engine that wants that thick cold viscosity but would pass on using it in a 997 or other newer engines.

silver_tt

I would send Lake a message but he's no longer with Driven so I don't think it's his job to answer the question for me. I was already bothering him a couple of weeks ago with a long email about a gapless ring set I plan to buy from him. He has always been very polite and responded quickly to my inquiries -- and I don't want to take advantage of that.

But looking at the GP-1 promotional video, it doesn't explicitly say you can run it in a 997 but it sure makes it seem like it. For example at times 0:28 and 1:44 the audio is going through the car types it's for and says "...for imports" and then it shows a picture of a 997 GT3 RS 4.0 on the track... twice.

I guess ultimately aside from the winter viscosity I see this oil as filling a "value" segment of the boutique oil market. I still don't like the 15 grade winter viscosity it comes with and would still not use it in a 997 because of this but even aside from that I also don't think there is anything GP-1 can do better than what a XP9/DI40 combo can do -- honestly I would bet that even DI40 straight up is probably a better track oil. The only thing GP-1 wins at is cheaper price which I don't care about.

Petza914

Driven is now referring their oil technical questions over to Charles at LN, at least they did to mine a couple weeks ago, and as usual, he was quick to respond.

silver_tt

Good info as always from you Petza, thanks. You are right:
https://drivenracingoil.com/p-35852-...-inquires.html

silver_tt

Looks like Driven very recently switched DI40 winter viscosities technically from a 0W-40 to 5W-40. All references to 0W-40 now say 5W-40 in several locations on their webpage and I'm assuming this is why they don't have the picture and says they are out of stock until October 1......

https://drivenracingoil.com/i-304977...motor-oil.html

I just had some delivered Thursday and looked just now, it's still 0W-40. Not a big deal but being a generally curious person I wonder what prompted the change....

Petza914

​​​​​
Thats funny. When they were releasing this product years ago they actually called it a 5w40 and printed bottles that way so the winter viscosity has always been right on the edge between 0w and 5w.

Here's the email I got from Lake when he was still at Driven.


Pete,


"Here are the viscosity specs for DI40.DI40

HTHS 4.2

Kv100= 13.98

Kv40= 81.18

VI= 178

Just an FYI, it is barely a 0W-40. It is right on the edge between a 5W-40 and 0W-40, so you don’t have to worry about giving anything up with it. The HTHS is very high as well."