What oil?

[Timco]

Originally Posted by Flavor 987S

Ones to consider:

Mobil 5W50
Redline 5W40
Joe Gibbs DT40 5W40
Motul 8100 5W40

Can't go wrong with any of these. All a "step-up" from Mobil 0W40....which is always my simple goal. UOA's support my choices.

Now we have an oil discussion.

What makes mobile 5w50 better than 0w40? Good to know.

[Flavor 987S]

Originally Posted by Timco

What makes mobile 5w50 better than 0w40? Good to know.

Slightly more zinc (about a 100 ppm at the end of the drain interval).
Slightly more phosphorus (about a 100 ppm at the end of the drain interval).
Much better SUS Viscosity at 210 degrees (less shearing of the oil).

[bwillia080261]

Originally Posted by Flavor 987S

Slightly more zinc (about a 100 ppm at the end of the drain interval).
Slightly more phosphorus (about a 100 ppm at the end of the drain interval).
Much better SUS Viscosity at 210 degrees (less shearing of the oil).

I understand the need for Zinc and Phosphorus. Which begs the question "What do you think of the ZDDP additives?"

[JFP in PA]

Originally Posted by bwillia080261

I understand the need for Zinc and Phosphorus. Which begs the question "What do you think of the ZDDP additives?"

Not much. To distribute ZDDP in synthetic oils, most compounders use specialized mixing processes that involve the addition of additives specifically to get it mixed in and keep it uniformly distributed in the final mix. One of the reasons synthetic oils have limited shelf life is because these ZDDP distribution additives fail over time and the oil begins to striate. So simply pouring in some expensive ZDDP into your oil is not going to get it uniformly distributed or likely to keep it there.

[Flavor 987S]

Originally Posted by bwillia080261

I understand the need for Zinc and Phosphorus. Which begs the question "What do you think of the ZDDP additives?"

FYI. Porsche NEVER recommends the use of any oil additive. Not that I do everything Porsche recommends (but most).

I'm not a believer in oil additives. I'm a believer in using a better oil (from data I see in my Used Oil Analysis- Blackstone Labs) and just changing the oil a little early. I do 5,000 mile intervals now. That's about 2 oil changes from April till October. The other months the car sits in my heated garage for winter storage. Not a daily driver. It's a sunny day toy.

This is really not rocket science. Pick a high quality full synthetic oil (Motul, DT40, M1 5W50....just to name a few) and change it at least every year and every 5,000 miles. It's pretty simple. Don't over think it.