Can Fully Synthetic Engine Oil Be Used in Any Car?
3 Answers
Fully synthetic engine oil is not suitable for economy cars or even some mid-to-high-end sedans. Here is relevant information: 1. Due to the lower manufacturing processes and technology of economy car engines compared to high-end sedans, using fully synthetic oil is not conducive to cold starts and may affect sealing performance, potentially leading to engine wear. Therefore, economy cars are best suited for semi-synthetic oil or the manufacturer-specified oil type. 2. Engine oil should not be changed arbitrarily. It is recommended to continue using the same type of oil as originally specified by the manufacturer. If the engine or computer has been modified, the decision to use fully synthetic oil should be made based on the specific circumstances. Additionally, since it is difficult to distinguish the authenticity of engine oil quality in the current market, it is advisable for car owners to change their oil at authorized 4S shops.
As a taxi driver with over a decade of experience, I can tell you that full synthetic oil isn't a one-size-fits-all solution. Back when I drove an old Jetta, I heard people raving about full synthetics and switched over, only to find the engine started leaking oil. An experienced mechanic later explained that the rubber seals in older cars can't handle the strong detergency of full synthetic oils. Now I drive a new Corolla where full synthetic works fine, but for vehicles over 10 years old or agricultural diesel engines, semi-synthetic or mineral oils are actually safer. Also, some German cars with particulate filters require low-ash oil - using the wrong full synthetic could clog the catalytic converter. Always check your owner's manual before changing oil, or better yet, stick with the manufacturer-certified oils from authorized service centers.
Over the years in auto repair, I've seen too many engines ruined by improper oil usage. While synthetic oil has more uniform molecular structure, older engines with larger cylinder wall gaps actually suffer from its thinner viscosity reducing oil film strength. For low-precision engines like vans, mineral oil forms sufficient protection. Turbocharged vehicles demand special attention - though most can use synthetics, ACEA certification levels matter. Last time, an N20 BMW owner damaged camshaft bearings using wrong viscosity oil to save money. New cars can follow manuals, but modified vehicles, high-mileage engines, or rotary engines require professional advice.
