Hey guys & ladies Long time lurker finally decided to get in on the action. Ive learnt quite alot reading these forums, im abit ocd with oil changes and takeing care of my car in general. So i think im at the right place. Anyway this i for my renault twingo RS 133 Its a 1.6 NA 4 cylinder currently sitting at 86,000miles This was my first ester oil ive used since owning the car and i could defitatly tell a little diffrence in idle and overall responsiveness The test was conducted bye mullercare here in the UK. 3000miles on this oil Oil used fuchs titan race pro 5w40 [email protected]Â° - 11.89cst [email protected]Â° g/ml - 0.864 Fuel dilution - 0.9% TBN mgkoh/g 7.26 Zinc - 0.099 Calcium - 0.266 Cr- 1 Pb- 1 Ni- 1 Sn- 0 B- 270 Fe- 17 Mo- 6 Si- 9 V- 0 Al- 12 Cu- 5 Na- 4 Action/diagnostic The vicosity is now a w30 grade due to cautionary fuel dilution Wear metals levels are satisfactory we would advise resample in 6000miles. Now from what can gather from this is the fuel dilution is affecting the viscosty grade quite rapidly really this oil starts around 14.9cst, which after 3000 miles wasnt expecting to see. The TBN still loojs great but was worried about the high boron im assumeing this is the additives in the oil. Doesnt seem too bad overall imo but what do you experts make of it. Should i stay at changing oil every 3000 miles due to the viscosty reduceing that low ?