Originally Posted By: Wilhelm_D
Originally Posted By: buster
... No oil – not even Mobil 1 – keeps an engine closer to factory clean than Pennzoil Ultra(3).... When it comes to pistons, the most difficult part of your engine to keep clean, Pennzoil Ultra keeps pistons up to 25 percent cleaner than Mobil 1(4).
I have never seen a sludged engine, stuck ring, or carboned valve stem in an engine that ran Mobil 1. How much cleaner than clean does this product make things?
Well my observations on this are:
1. Why M1 and not M1 EP?
2. Why only 5w30? I assume because it is the most popular grade?
3. Interesting that they state UP TO 25% cleaner. Meaning they likely ran the test a significant number of times, one of them was 25% better, hence the "up to".
4. If factory clean is 0 and fully bunged up is 1000, fail for this test is 500 and Mobil 1 scored 20, that means PU scored 16. The closer to 0 you get here, the less significant the results become.