I run diesel oil. Shell Rotella T with STP oil additive on top. They didn't remove the good stuff from diesel oil since they run no catalytic.

The Brad Penn stuff is good too I hear.

 

I use the most expensive penetrating lubing oil for my vehicle

 

Mobil 1 Synthetic....Its about the only thing on the space shuttle that hasn't failed!

 

+1

 

i'm on cheap shit right now, since the new engine has about 10 miles on it, but it'll be rotella for a flush, and then Amsoil 0w-20, and the S2000 and the Jeep will be getting the same

 

Needs to drive the lude out to the meet tommorow.

 

Castrol GTX is on sale at Advanced for $7.98 a gallon, until April 28th.

 

Can I use a diesel motor oil in a car?
The newest CJ-4 formulations are now limited in the amounts of Zn and P allowed, compared to the CI-4 formations most users are familiar with. If the oil says CJ-4 or LE or "Low Emissions", even if it also lists CI-4 or CI-4+, more than likely it conforms to the new, lower levels, and should be avoided unless you have a 2007 and later diesel which requires these oils. The verdict is still out in my opinion on the performance of a CJ-4 oil in our application. If you choose to use a diesel or mixed fleet oil, stick to an a CI-4 rated oil. Nowhere should the oil say for emission system protection or for use in engines equipped with particulate emissions filters. Swepco 306 15w40 is one such example of an extraordinary diesel oil we use in our performance engines. Swepco 306 has a healthy dose of boron and moly also for additional ant-wear response.

Worth noting, CI-4 diesel motor oils tend to have more detergents, and it has been determined in the SAE paper "Oil Development for Nascar" that overly detergent motor oils can block or "clean" the anti-wear films off of engine parts, that is one reason that these oils usually have high levels of anti-wear additives. SAE Technical Paper Series 2007-01-3999, Modern Heavy Duty Engine Oils with Lower TBN Showing Excellent Performance, also show that low detergent packages increase the effectiveness of film formation, just as in racing oils tend to have less aggressive detergent packages, which is another reason many be to consider a racing oil versus a diesel oil for your engine. The new ACEA E9 specification will be for a low Zn and P (ash) oil with low TBN, building upon this relationship to ensure that wear protection is not sacrificed for improved detergency or longer drain intervals.

 

i'm only going to use it for one oil change simply to clean it out, and then run the amsoil after that

 

Mobil 1 5W30

With almost 200,000 miles on my Ranger, the valve train looks like new and it run like a top with no ticking, smoking, etc.