Oil recommendation?

Seriously, this is the most over-thought nonsense topic and in every vehicle forum. I have 130K on my 08 6cyl Limited. I buy whatever brand name 5W-30 standard oil (non-syn) is on sale at Walmart and I buy Toyota standard filters (on Amazon bulk) with standard washers and change oil every 5-6K miles. I document oil changes and have done 22 so far on my 08. With filter on the top and 18” wheels this is a very easy 15-20 minute job for about $20. I use syn oil on vehicles that manufacturer requires like my vette. Don’t overthink, don’t waste money on designer oil, dont believe “slick molecules” advertising......

This. The synthetic oil in the Supertech container is essentially identical to Mobil 1, and dino is very good too, so the long-term difference in engine wear is almost certainly negligible regardless of what oil you use (assuming the correct weight & spec). There are only so many refineries and there’s sure not a subpar one where all the cheaper oil is made.

But don’t get me wrong - while I know the above to be true, it’s still hard for me to buy off-brands. Credit the power of advertising I suppose.
 
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Rotella T6 doesn't meet the classification for gasoline engines oils because of the higher phosphorus content. If your engine is consuming noticeable oil like 1 quart per 1K miles, the phosphorus deposits will clog your cats pretty quickly..

To some extent you're wrong.

Rotella T6 is API-SM rated, so it means that it does meet the classification for gasoline engines. The ZDDP content now, is much less than it was before, but still contains a relatively high ZDDP level(compared oils normally marketed for gasoline engines), which could eventually kill cats. It makes sense though, as it is marketed for Diesel motors. Even though it's marketed for Diesel motors, I wouldn't be afraid to run T6 in my motor, as it is technically an oil designed for heavy duty use.

And if you're consuming oil, you'll kill your cats much faster than just running T6 in a healthy motor.
 
To some extent you're wrong.

Rotella T6 is API-SM rated, so it means that it does meet the classification for gasoline engines. The ZDDP content now, is much less than it was before, but still contains a relatively high ZDDP level(compared oils normally marketed for gasoline engines), which could eventually kill cats. It makes sense though, as it is marketed for Diesel motors. Even though it's marketed for Diesel motors, I wouldn't be afraid to run T6 in my motor, as it is technically an oil designed for heavy duty use.

And if you're consuming oil, you'll kill your cats much faster than just running T6 in a healthy motor.

To some extent you're wrong as well.

SM is an outdated approval rating from API that ended in 2010, with the introduction of the SN rating. T6 did have the SN rating for a while as well but it was removed a couple years ago due to stricter rules by API for phosphorous content. API "moving the goalposts" so to speak. You won't find the API SM or SN logo on a new package of T6. It's no longer listed in their approvals on their website or product brochure. 5W-40 Synthetic Diesel Oil | Shell Rotella® T6 Full Synthetic | Shell ROTELLA®


We do agree it should have no issues in the 4th gen and I see it as a good summer oil , but only if it's on sale. Right now a a jug of T6 costs me the same as a jug of Motul. I'm going with the Motul if I'm paying that much.
 

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