The aim of testing the synthetic engine oil ADECO® ULTRA SYNTH PRO SAE 5W-30, was to determine the degree of degradation and determine the optimal service interval of this oil, in real operating conditions, in the diesel engine of a passenger car Ford Focus MK II 1.5.
Exploitation testing has shown that for this engine oil, in normal operating conditions, the optimal replacement period is up to 30,000 kilometers.