1970-02-01

The Effects of Some Engine, Fuel, and Oil Additive Factors on Engine Rusting in Short-Trip Service 700457

Forty-one short-trip service tests were run using 1964-1969 model U.S. passenger cars and 19 commercial or experimental oils evaluating several aspects of engine rusting. These factors included differences in rusting severity among engine models, effects of fuel variables on rusting, and the effects of oil additive type and concentration on rusting.
Rusting severity varied widely among engine models, but different engines ranked similarly the rust protection provided by oils with differing additive treatments.
Use of either nonleaded gasoline or LPG instead of leaded gasoline greatly reduced engine rusting.
At equivalent additive treatment levels, several magnesium sulfonates provided better rust protection than did certain calcium sulfonates, calcium phenates, or a barium sulfonate. Rust protection increased greatly and approximately linearly with increasing magnesium content.
From these tests, and those reported by others, there appear to be three requirements for engine rusting to occur:
  1. 1.
    Addition to the crankcase of corrosive products from the gasoline lead antiknock scavengers and combustion products.
  2. 2.
    Cold engine operation, permitting condensation and accumulation of corrosive products in the oil.
  3. 3.
    Depletion of rust-preventing oil additives.
Since the first two requirements are at present largely uncontrolled from the customers' standpoint (most gasolines are leaded and contain scavengers, and winter weather is cold in many areas), the only other apparent avenue for improving the rust protection provided to current-design engines using leaded gasolines is better rust-preventing additives in the oil.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
JOURNAL ARTICLE

Controlling Low-Speed Pre-Ignition in Modern Automotive Equipment Part 3: Identification of Key Additive Component Types and Other Lubricant Composition Effects on Low-Speed Pre-Ignition

2016-01-0717

View Details

TECHNICAL PAPER

“Smart sensing” of Oil Degradation and Oil Level Measurements in Gasoline Engines

2000-01-1366

View Details

TECHNICAL PAPER

A Practical Application of Engine Inspection Observations and Used Gas Engine Oil Analysis

730744

View Details

X