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Attached, are the safety data sheets (from the manufacture's websites) for both products. Both indicate that the primary ingredient is CAS 64742-54-7, which is a Group 3 base.

Has anyone else noticed that Castrol has issued new MSDSs for their German produced 0W-30 and 0W-40 products? The latest documents indicate >=25%-=50%-<=75% PAO.

Curiosity more than anything else. I've been a long time BITOG member and watcher, however I don't post very often.

The MSDS for 0W-40 German Castrol lists "Pentadecane, 7-methylene-, mixed with 1-tetradecene, dimers and trimers,hydrogenated" as the base oil. Does anyone have a clue what this is (PAO, Ester, baby oil, etc.)? Thanks!

Well, let's look at the condition of the Mobil1 TDT for this UOA: 1. still has an acceptable TBN 2. contains no water/antifreeze 3. very low insoluables 4. extremely low silicon 5. contains a trace of fuel - we've had some cold weather here in Wisconsin already 6. it is shearing slightly out of...

I’m inclined to agree with WEBFORS, as long as wear remains low, the rest is minutia. I’m planning to continue with M1 TDT as it’s readily available and my fuel mileage has averaged around 30 MPG, which I can’t complain about. Thanks for your feedback!!

Just to clarify my daubts regarding fuel dilution. 95%+ of this vehicle's mileage is at freeway speeds. I drive a minimum of 170 miles per day.

With only a trace of fuel, so that makes no sense. This engine is a well known "Shear Monster"...

Your thoughts? Analysis by Blackstone... Thanks! Comments: It's another good report for your Audi. This oil was run just under 6,000 miles, but you couldn't tell it by looking at wear. All wear either held steady or improved over what we found last time and that is an excellent sign that no...

Here's the link to my latest M1 TDT UOA: http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1643096

I've been running Mobil 1 TDT 5W40 in my Audi 2.0 FSI Turbo engine (which is a shear monster) and it's been shearing out of grade after 5K miles. As I drive roughly 6K miles per month (mostly highway), I'm very interested in extended drains. Do you think Delvac 1 would be worth a try? Thanks...

Remember, the purpose of higher viscosity is to reduce wear. So, as long as wear rates remain low, I'm going to stick with Mobil1 TDT.

You're correct, it is the CJ-4 formula... Thanks for all of your feedback!

Your Thoughts? Code: OIL Mobil 1 TDT 5W-40 REPORT DATE 10/22/09 MI/HR on Oil 4550 MI/HR on Unit 54303 Sample Date 10/03/09 Make Up Oil Added 0 qts Comments: You shortened your oil use to 4,550 miles and there was a significant improvement in iron, which comes from steel parts...

Here's the latest analysis for my 06 A4 2.0T Code: OIL Mobil 1 TDT 5W-40 REPORT DATE 10/22/09 MI/HR on Oil 4550 MI/HR on Unit 54303 Sample Date 10/03/09 Make Up Oil Added 0 qts Comments: You shortened your oil use to 4,550 miles and there was a significant improvement in iron...

My intent is to run oil analysis until I feel comfortable with the results and OCI. I already have 1400 miles on the current change, so I should have another report by the end of August... Thanks for the feedback!

Blackstone indicates the universal average for Fe in this engine is 30. Many of the other reports I've seen have Fe in the upper 30s...

This is the first analysis (Blackstone) after purchasing this car with 39K on it. Oil changed after 1 week of driving. 90%+ highway miles, average 800-1000 miles per week. Your thoughts? Thanks! Comments: The universal averages show average wear for the Audi 2.0L Turbo engine after 5,400 miles...

Double Duh! Mobil 1 0W-40 BTW, I average 800-1000 highway miles per week Thanks!

Well duh, I knew better than that, here are the comments and results. 90% plus highway miles, let me know what you think... The universal averages show average wear for the Audi 2.0L Turbo engine after 5,400 miles of oil use. You ran your oil 5,239 miles and all of the wear metals read below...