Hello Again.
Finally retired the old X-Type (Ford Mondeo) in favor of another real Jaguar. Just bought 2012 XF Portfolio. 10K miles. Ok enough background.
On with my concern. For the record, I run Total Quartz Energy 9000 0W30 in ALL my vehicles. Years of astonishing UOA's have proven, beyond any doubt that's the way to go for ME. I even run that A3/B3/B4 High HT/HS 0W30 in my Supercharged Jaguar which is spec'ed for A1/B1 A5/B5 Low HT/HS 5W30.
Here is where I hesitate. This new XF 5.0L calls for 5W20 ONLY. The manual does not give any viscosity variations at all. It strictly says 5W20 ONLY "or else engine damage may occur... blah...blah...blah..." Obviously low HT/HS, designed for saving the cats and fuel economy and, in my opinion, not the greatest oil film in a high RPM, high heat, TRACK type situation. I drive my cars hard, but I try to maintain the heck out of them. Religious oil and filter changes every 5000 miles. NO exceptions.
I would LOVE to run the Total Quartz Energy 9000 0W30 high HT/HS A3/B3/B4 229.5 VW 502.00 etc... in my new Jaguar XF. I personally don't think it will damage anything, and I am pretty darn sure the UOA's will show less wear. Does ANYONE know if there is a mechanical or an engineering reason, difference or whatever, why Jaguar says 5W20 ONLY. Why wouldn't a 30 weight (hot) higher film strength fully synthetic oil do? (I don't care about mileage, just engine wear and longevity)... I am not trying to start an oil brand debate either. I know there are plenty of other adequate oils out there... many meeting the same specs.
I simply would love to know if 0W30 can safely be used in a 5W20 spec'ed ONLY (supposedly)5.0L engine. In other words, going from a 20 weight, to a 30 weight. The first number doesn't matter to me as I prefer the 0 weight anyways.
I wish to thank everyone for their input.
Finally retired the old X-Type (Ford Mondeo) in favor of another real Jaguar. Just bought 2012 XF Portfolio. 10K miles. Ok enough background.
On with my concern. For the record, I run Total Quartz Energy 9000 0W30 in ALL my vehicles. Years of astonishing UOA's have proven, beyond any doubt that's the way to go for ME. I even run that A3/B3/B4 High HT/HS 0W30 in my Supercharged Jaguar which is spec'ed for A1/B1 A5/B5 Low HT/HS 5W30.
Here is where I hesitate. This new XF 5.0L calls for 5W20 ONLY. The manual does not give any viscosity variations at all. It strictly says 5W20 ONLY "or else engine damage may occur... blah...blah...blah..." Obviously low HT/HS, designed for saving the cats and fuel economy and, in my opinion, not the greatest oil film in a high RPM, high heat, TRACK type situation. I drive my cars hard, but I try to maintain the heck out of them. Religious oil and filter changes every 5000 miles. NO exceptions.
I would LOVE to run the Total Quartz Energy 9000 0W30 high HT/HS A3/B3/B4 229.5 VW 502.00 etc... in my new Jaguar XF. I personally don't think it will damage anything, and I am pretty darn sure the UOA's will show less wear. Does ANYONE know if there is a mechanical or an engineering reason, difference or whatever, why Jaguar says 5W20 ONLY. Why wouldn't a 30 weight (hot) higher film strength fully synthetic oil do? (I don't care about mileage, just engine wear and longevity)... I am not trying to start an oil brand debate either. I know there are plenty of other adequate oils out there... many meeting the same specs.
I simply would love to know if 0W30 can safely be used in a 5W20 spec'ed ONLY (supposedly)5.0L engine. In other words, going from a 20 weight, to a 30 weight. The first number doesn't matter to me as I prefer the 0 weight anyways.
I wish to thank everyone for their input.