986 Forum - The Community for Porsche Boxster & Cayman Owners - Yet another oil thread *caution* science content

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Quote:

Originally Posted by Paul (Post 441429)

I've heard new front CATs are $4000 each....

I can get new Porsche Boxster 986 / S NHP 200 Cells Exhaust Headers for $1,244.90. That includes both sides and shipping.

Quote:

Originally Posted by Paul (Post 441429)

I've heard new front CATs are $4000 each....

You can do better than that price. And the engine costs one Hell of lot more than that.

New factory cats are crazy expensive. I have a set of low mileage takeoffs for $200 from a guy that installed headers. When mine go I will swap them.out and hopefully get a long life out of them.

There are lots of oils with high ZDDP. Excessive ZDDP will 'poison' the cats. So 'more is better' has limits.For example, Mobil 1 5-40"Turbo Diesel"has more ZDDP than regular Mobil 1.
The question is the balance in the additive package.
I linked an old comparative list some time ago from BITOG for film strength and ZDDP. Motorcraft 5-50 was surprisingly good in that comparison JGibbs was included in the list.
But there is way more to the issue than just two factors in the additive package.
11. 5W50 Castrol Edge with Syntec API SN, synthetic, formerly Castrol Syntec, black bottle = 75,409 psi
zinc = 1252 ppm
phos = 1197 ppm
ZDDP = 1200 ppm

8. 10W30 Joe Gibbs HR4 Hotrod Oil synthetic = 86,270 psi
zinc = 1247 ppm
phos = 1137 ppm
ZDDP = 1100 ppm

3. 10W30 Valvoline VR1 Conventional Racing Oil (silver bottle) = 103,505 psi
zinc = 1472 ppm
phos = 1544 ppm
ZDDP = 1500 ppm

For the oil Geeks only:
http://speedtalk.com/forum/viewtopic.php?f=1&t=35836
http://www.intellidog.com/dieselmann/powers~1.htm
http://www.machinerylubrication.com/Read/255/oil-foam
http://www.bobistheoilguy.com/motor-oil-101/

I've been buying my Joe Gibbs Racing DT40 from Summit Racing in MacDonough GA.

Once you are on their mailing list I think they'll occasionally shoot you a $20 off coupon for orders over $100. They also discount the price when you buy oil by the case. Comes to around $10 a quart (or less) that way. Also free shipping via UPS ground to anywhere in the US, but I prefer to drive down to Summit with my Boxster - makes for a nice drive (any excuse for a drive is good when you have a Boxster). :)

Quote:

Originally Posted by Gelbster (Post 441473)

There are lots of oils with high ZDDP.

Including Mobil 1 0W-40

Quote:

Originally Posted by lkchris (Post 441489)

Including Mobil 1 0W-40

While high additive levels are a good start, it takes more than just ZDDP to make a good oil.

Just because their name is plastered on race car via PAID sponsorship or contingencies doesn't mean it's the best oil. I would bet they don't run off-the-shelf street car Mobil 1.