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secondchance · 02-27-2019

I just want to make it crystal clear that Mobil 1 high mileage had 1000 ppm phosphate and 1100 ppm zinc and that is what I had been using. Then I found, according to current product guide, Mobile dropped phosphate and zinc levels to 800 and 900 respectively. As to new additives to off set this reduction, I have no idea.
I am no mechanical engineer and have no means nor intention of running controlled test. 32valvesftw reporting zinc level of 870 ppm after 8000 miles may be indicative of Mobil 1 High Mileage product guide stating zinc level of 900 ppm.
Fully understanding negative consequence of excessively high ZDDP level, should we be concerned of substantially lower level relative to level expected when originally specified for LT5?
I agree with Paul that a particular car in stock form being driven occasionally and rarely seeing 7000 may be fine. However, we are pretty picky bunch committed to health and longevity of our cars. Aren’t we?
Once I realized new reformulation had changed and it caught me by surprise, thought to share with others. How we respond to this, I figure will be individual choices.

02-27-2019	#52
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,730	Re: Amazon engine oil vs the world I just want to make it crystal clear that Mobil 1 high mileage had 1000 ppm phosphate and 1100 ppm zinc and that is what I had been using. Then I found, according to current product guide, Mobile dropped phosphate and zinc levels to 800 and 900 respectively. As to new additives to off set this reduction, I have no idea. I am no mechanical engineer and have no means nor intention of running controlled test. 32valvesftw reporting zinc level of 870 ppm after 8000 miles may be indicative of Mobil 1 High Mileage product guide stating zinc level of 900 ppm. Fully understanding negative consequence of excessively high ZDDP level, should we be concerned of substantially lower level relative to level expected when originally specified for LT5? I agree with Paul that a particular car in stock form being driven occasionally and rarely seeing 7000 may be fine. However, we are pretty picky bunch committed to health and longevity of our cars. Aren’t we? Once I realized new reformulation had changed and it caught me by surprise, thought to share with others. How we respond to this, I figure will be individual choices.