Delo. Let s go further. Delo 400 SDE SAE 15W-40 with ISOSYN Advanced Technology is a heavy duty engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines and four-stroke gasoline engines in which the API CK-4 or SN service category and SAE15W-40 viscosity grade are recommended. Delo 400SDE 15W-40 is also backwards compatible with diesel engines in which the API CJ-4 CI-4 CI-4 Plus and CH-4 service categories are recommended. Delo 400 SDE SAE 15W-40 with ISOSYN Advanced Technology helps keep rings clean and free for maximum combustion pressure and minimal wear. Delo 400 SDE SAE 15W-40 minimizes valve and piston crown land deposits thereby maintaining minimal oil consumption. Its high level of ash-less dispersants keep fuel soot in suspension and help avoid filter plugging heavy cylinder head sludge abrasive polishing wear high viscosity increase and oil gelling. These problems can result in excessive engine wear and bearing failure on startup without prior indication to the operator. Specially selected oxidation inhibitors control oxidation sludge and undue thickening during oil drain periods. Delo 400 SDE SAE 15W-40’s unique anti-wear additive protects against valve train wear and scuffing of highly loaded parts operating under boundary lubrication. A specially selected viscosity index improver ensures easy flow at low temperatures and excellent film protection in hot engine areas. The combination of premium dispersant additives and ISOSYN Advanced Technology allows Delo 400 SDE SAE 15W-40 to effectively disperse soot and keep it in suspension. This minimizes the risk of valve train wear lever polishing and filter plugging.