Re: Best Engine Oil with enough Zinc
Even though you described the speaker as an "oil industry engineer..." I smell "salesmen".
This "detergent myth" you describe is a common pitch from boutique oil and additive salesmen. Other than differences in the combustion process diesel and gasoline engines have the same basic lubrication requirements, but the C-category tests are more severe and they have a richer additive package due to the more harmful and corrosive combustion byproducts including soot. The lower limitation of P in current S-category oils is the primary reason why C-category should be used in vintage engines with sliding surface valve train components. Everything else in C-category oil is a bonus for the same price as S-category.
Consider than modern over-the-road HD diesel engines are expected to run at least 500K miles between overhauls and some can run a million. If the detergents "wash off everything include the oil", how can they run this far?
TOTAL NONSENSE!!!
HD CNG engines are usually HD diesel designs modified to hold a spark plug instead of injector and slightly lower CR, and they specify C-category oils.
As I described in my "Engine Oil for Vintage Corvettes" article (The link is in post #12. Send it to your A-H buddy) prior to the P limitation that began with SL, most name brand engine oils that were marketed to car owners were dual-rated and were perfectly suitable for for diesels, and conversely, modern C-category oils are dual rated for SI engine service.
About ten years ago my chapter said they had invited a guy to talk about engine oil who was clearly a salesman. I suggested they cancel him and I'd do the presentation, and that led to my oil article that was originally published in The Corvette Restorer, which I wrote to dispel all the marking BS and myths that are floating around.
You can spend the rest of you life reading the "Bob the Oil guy" web site. I looked at it in the past, and though I'm sure most of the posters have good intentions, I never saw one who gave me any indication that they had any educational/professional experience in engine lubrication technology or oil formulation and testing, and I don't ever recall seeing any mention of the API, which is the organization that establishes engine, transmission, and axle oil specifications for the entire automotive industry including HD trucks and the military.
The world is full of people who are well intentioned, but clueless.
Duke
Even though you described the speaker as an "oil industry engineer..." I smell "salesmen".
This "detergent myth" you describe is a common pitch from boutique oil and additive salesmen. Other than differences in the combustion process diesel and gasoline engines have the same basic lubrication requirements, but the C-category tests are more severe and they have a richer additive package due to the more harmful and corrosive combustion byproducts including soot. The lower limitation of P in current S-category oils is the primary reason why C-category should be used in vintage engines with sliding surface valve train components. Everything else in C-category oil is a bonus for the same price as S-category.
Consider than modern over-the-road HD diesel engines are expected to run at least 500K miles between overhauls and some can run a million. If the detergents "wash off everything include the oil", how can they run this far?
TOTAL NONSENSE!!!
HD CNG engines are usually HD diesel designs modified to hold a spark plug instead of injector and slightly lower CR, and they specify C-category oils.
As I described in my "Engine Oil for Vintage Corvettes" article (The link is in post #12. Send it to your A-H buddy) prior to the P limitation that began with SL, most name brand engine oils that were marketed to car owners were dual-rated and were perfectly suitable for for diesels, and conversely, modern C-category oils are dual rated for SI engine service.
About ten years ago my chapter said they had invited a guy to talk about engine oil who was clearly a salesman. I suggested they cancel him and I'd do the presentation, and that led to my oil article that was originally published in The Corvette Restorer, which I wrote to dispel all the marking BS and myths that are floating around.
You can spend the rest of you life reading the "Bob the Oil guy" web site. I looked at it in the past, and though I'm sure most of the posters have good intentions, I never saw one who gave me any indication that they had any educational/professional experience in engine lubrication technology or oil formulation and testing, and I don't ever recall seeing any mention of the API, which is the organization that establishes engine, transmission, and axle oil specifications for the entire automotive industry including HD trucks and the military.
The world is full of people who are well intentioned, but clueless.
Duke
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