Engine oil Mobil or Kendall

I ran 15w50 for a year, and my car ran at least 10 degrees hotter all the time, than when I switched to 5w40.

I've been on the Vortex for quite some time and remember several years ago a Vortex member sent in samples of used oil from their VR6 to a lab for testing. They used Mobil-1 Tri-Synthetic and Valvoline SynPower (both in ~4000 miles) in the same engine and sent in the samples. It's been so long ago, I don't remember the specifics on viscosities etc., but I do remember how Mobil-1 did not hold up well at all compared to Valvoline. In fact, it was stated in the results that after 4000 miles, the Mobil-1 sample was unusable.

Mobil 1 0W40 European car formula.

I run 0w40 Mobil1 year round. I used to use 15w50, too thick for me. Car runs a bit cooler (oil temps) and revs easier with the 0w40. In the cool months, it gets up top nice and fast. No problems, I like the stuff.

I work at a dealership, and they use Mobil 1 TriSynthetic 0W-40 from the factory for Porsche... so that's what I use.

I use 20w50 in the summer, and I just put in 10w30 for the winter...car starts up much better afterwards...oh yeah, I run mobil1 full synth

I agree!! Mobil 1 15W50 is the best for vr6

Mobil 1 15W50

Changed it for Mobil 1. My owner's manual specifies API CD oil, so the mobil 1 should be fine (says it is suitable for CF applications).

API (SF) oil usualy contains way more detergent than Diesel CF grade oil. I'm not sure what this kind of oil can do to your engine... But I would suggest using Mobil Delvac 1 oil.