Do Oil Additives Work?

[oldgeek]

I asked Gemini to summarize this video as it is long and I didn't want to sit through it.

This is the summarization with time stamps:

The Core Conclusion​

Based on statistical analysis of over 8,000 gasoline and 2,900 diesel engine samples, adding aftermarket oil additives makes no statistically significant difference in engine wear. The experts emphasize that modern engine oils are already highly optimized through millions of dollars in research and development [12:40].

Key Insights from the Data​

• Contamination is the Real Enemy: Factors like fuel dilution, silicon (dirt), and internal particles have a far greater impact on engine wear than the brand of oil or any additive used [46:02].
• The "Break-In" Curve: Engines naturally experience high wear during their first few thousand miles. Data shows this wear levels off significantly as the engine ages, regardless of additives [35:18].
• Psychology vs. Data: High-end vehicle owners (like Porsche or BMW drivers) are statistically more likely to use expensive oils and then add expensive additives, despite the data showing no added benefit [29:52].
• Diesel Specifics:
  
  • Bypass Filters: Unlike chemical additives, physical bypass oil filters in diesel engines did show a measurable reduction in wear by better managing soot and fine particles [01:16:45].
  • Fuel Lubricity: While oil additives didn't help, the experts noted that fuel additives can be beneficial for protecting specific components like the Bosch CP4 fuel pump from low-lubricity ultra-low sulfur diesel (ULSD) [58:11].

Why Additives Can Be Risky​

• Chemical Imbalance: Adding a "chemical grenade" can throw off the carefully balanced formulation of licensed oils [02:08].
• Seal Compatibility: Many additives are not tested for compatibility with modern engine seals and wet belts, which can lead to premature failure [01:21:50].
• Reduced Stability: Certain additives can actually lower the oxidative stability of the oil, leading to faster degradation and deposit formation [01:23:41].

Maintenance Recommendations​

1. Use High-Efficiency Filters: Choose filters with the highest efficiency at the lowest micron rating [04:01].
2. Follow Filter Lifespans: Don't change a high-quality filter early; it actually becomes more efficient as a "dust cake" forms during its rated life [04:40].
3. Prioritize Cleanliness: Focus on high-quality air filtration and managing fuel dilution rather than buying "mechanic in a can" supplements [01:13:40].

 

[pentode]

I've watched quite a few of his videos and I think there are a couple general takeaways from all of them.

1) Modern engine oils (API SP and SQ) are great

2) Follow manufacturers recommendations and you'll pretty much be fine

It's pretty reassuring actually and really simplifies things.

 

[85_Ranger4x4]

I've watched quite a few of his videos and I think there are a couple general takeaways from all of them.

1) Modern engine oils (API SP and SQ) are great

2) Follow manufacturers recommendations and you'll pretty much be fine

It's pretty reassuring actually and really simplifies things.

ZDDP additives are rather important for young flat tappet camshafts however and are very lacking from most modern oils.