04 Lexus RX330 231,500 miles - valve cover pics

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I would just say that changing the oil at a decent interval kept the engine clean. Even without Tufoil, you would have gotten the same cleanliness.
 
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I wasn't saying Tufoil was responsible for the cleaning. There is much hype on this site regarding the use of additives ... I wanted to show an example of long-term use of the product. Clearly Pennzoil is a great oil and I have used it for many years.
 
I have heard pennzoil having the best detergents out of all the full synthetics. I still haven't used Pennzoil Platinum with pure plus technology ever since it came out back around 2014. I purchased 5 quarts of PP for my car but my brother needed an oil change and it was Christmas 2017 but all stores were closes so we used it on his car. So I never tried it, but I will next oil change.
 
Great choice of oil filter too. The OEM filter.
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