I'm changing brand of oil.

[jsceash]

Here is another really good read. LN Emgineering has been doing motor long enough that well you know.
https://www.lnengineering.com/oil.html#Z4

[Flavor 987S]

Guys (and Gals), we are lucky enough to have one of the smartest Porsche Boxster experts tell us to use Joe Gibbs DT 40 5W40. And made it available to us retail.

Hello!

Enough said.

Thanks Flat 6 Innovations.

You don't need to know everything, just people who do.

[Joshnich]

FWIW my mechanic uses ELF 5-40 synthetic. Hard to find but he swears by it.

[insite]

a lot of people seem concerned with anti-wear addititves. show me ONE boxster engine that simply wore out. i think they are few. far more often, substantial & catastrophic damage occurs that is more likely the result of viscous breakdown at high temperature. IMO, this is a direct result of low 'W' weight base stock that is used to improve fuel mileage.

0W and 5W oils use light base stock. additives are used to thicken it at higher temps. OEM's choose these because they help the manufacturer achieve CARB standards for fuel mileage.

my vote is, and always has been, to go with a thicker base stock & worry less about startup wear. FYI, racing motor oils tend to be single viscosity, heavier weight oils. there is a good reason for this.

i use castrol 20W-50. if my car didn't see the track, i'd probably use 10W-40. ZDDP is a bonus, but i think thicker oil = longer engine life for us.

[darknight]

Originally Posted by insite

a lot of people seem concerned with anti-wear addititves. show me ONE boxster engine that simply wore out.

This topic is probably one of the most recurring topics of debate that seem to draw battle lines and start wars. If you religiously change the oil and filter, with a quality synthetic, every few thousand miles, then you probably don't have much to worry about as far as "wearing" out your engine.

I understand why many of us are paranoid about engine failure; however, I think that the benefits of using ONLY one or two brands of boutique oils is equivalent to splitting hairs.

[l3m]

Here's a good read. I use Castrol Edge 5W-40.

FerrariChat.com - FAQ: Motor Oil Articles by Dr. Ali E. Haas (AEHaas)

[insite]

Lots of half-truths and misinformation IMO. That guy is a surgeon, not a tribologist.

[Frodo]

Originally Posted by insite

Lots of half-truths and misinformation IMO. That guy is a surgeon, not a tribologist.

"Tribologist"?? That's a fair number of syllables for you, insite...I confess to having to look that one up myself. I AM impressed!