Oil brand recommendation

[icb]

Lokasil and alusil blocks need Molybdenum; a friction modifier to minimize silicon migration out of the cylinders over time which is a big contributor for bore score. 4 years ago I switched from LiquiMoly 5W-40 to Driven DT40 5W-40 Oil. 07CS Manual 52K mi. I pull a UOA sample on my Oil /filter changes and Molybdenum element PPM's with LiquiMoly ran 97 ppm's. With Driven oil Molybdenum ppm's increased to 427 ppm's. Proof is in the numbers.....

I had the same experience. DT40 is expensive but worth it.

[jack911s]

I use Porsche Classic Motor oil, specially formulated by Porsche for Air Cooled 3.0L and above.
My 911 told me she loves it !

[NormGarr87]

I have an 03S and use DT-40 5W/40. I do an oil sample with each yearly change and the numbers look great. I purchased the car in 2017.

[996C438]

DT40 is an oil that was invented via collaboration between Jake Raby/Charles Navarro/Lake Speed Jr . Somewhere in that mix Joe Gibbs Racing was involved . Some would consider it a boutique oil but it was specifically designed for the 986/996/987/997 series of engines .

[NormGarr87]

My two cents. I run Driven DT 40 in my 03S. The PO used it so I continued. I have owned my Boxster for 7 years now and all my oil reports have been spot on. My Boxster is a limited use fun machine for the street. I do not track but I REALLY enjoy the NC mountains.

[cgfen]

We all have favorites, but for your use case, nearly any major brand will work well, just change it every 18 months or less.
Enjoy!

[zooklm1]

It might not be a great comparison but in my 968 and 944 turbo I use Valvoline VR1 20-50 racing oil and add a bottle of Liquid Moly Hydraulic Lifter Additive for the 944 Turbo to quiet the lifters. I started using the VR1 years ago when my turbo started using/burning a quart of every 500 miles. When I changed to VR1, oil consumption dropped to the nominal leakage around the oil pan gasket. I had initially thought the turbo oil seals were starting to fail. Answers on several forums suggested to try VR1. VR1 has a higher zinc content than most big name oils but not sure how it compares to the specialty brands.

[Tom]

It might not be a great comparison but in my 968 and 944 turbo I use Valvoline VR1 20-50 racing oil and add a bottle of Liquid Moly Hydraulic Lifter Additive for the 944 Turbo to quiet the lifters. I started using the VR1 years ago when my turbo started using/burning a quart of every 500 miles. When I changed to VR1, oil consumption dropped to the nominal leakage around the oil pan gasket. I had initially thought the turbo oil seals were starting to fail. Answers on several forums suggested to try VR1. VR1 has a higher zinc content than most big name oils but not sure how it compares to the specialty brands.

Any reason you picked Liquid Molly over a ZDDP/zinc additive?

[zooklm1]

Not really. Would more ZDDP help reduce the lifter noise? Any recommendations?
Lee

[Tom]

Not really. Would more ZDDP help reduce the lifter noise? Any recommendations?
Lee

In theory, but I was intrigued by your comment about liquid Molly...