Hello everyone.Maybe someone has thoughts to this question. I just bought my son a 2000 Ford KA 1.3 Enduratech engine.He lives in Germany full time and i 6 mo during the year so i will be maintaining it. The engine has flat tappets,cam in block,from what i read this engine has its roots in the old Ford Anglia engine.All iron construction,timing chain,70hp,very old school.I looked for the car based on these engine qualities as well as on condition. I gave the engine a tune up and used Shell Helix Diesel Plus VA 5W-30 oil.This oil is speced for gas engine use also. The owners manual specs 5w-30.I could of also used Shell Helix Diesel Plus VA 5W-40 which appears to be the same specs as the U.S. RTS. These are the specs on this oil. Shell Helix Diesel Plus VA 5W-30 ACEA A3/B4 API SL/CF Dichte bei 15°C kg/m³ DIN 51757 855 Flammpunkt nach Cleveland °C DIN ISO 2592 220 Dynamische Viskosität bei –20°C mPa s DIN 51377 3250 Kinematische Viskosität bei 40°C mm²/s 91 bei 100°C mm²/s 14 DIN 51562 Viskositätsindex (VI) DIN ISO 2906 160 Pourpoint °C DIN ISO 3016 -33 The car will see weekly 5ookm autobahn [email protected] The engine has 62k km or 40k mi and has perfect compression.Under the valve cover is spotless. This oil is listed by law as a semi synthetic,in the U.S. it qualifies as a full synthetic i.e.RTS. Would the 5w-40 which cost approx the same be better suited to this car? What would be a safe OCI?I was thinking 7-8k km?