Engine oil mixing is risky and can lead to engine trouble and higher repair costs. A technical director from the Fit Service international car care network, speaking in an interview, warned that combining different oils should be avoided unless there are extraordinary circumstances. The core message is clear: do not mix motor oils unless there is no alternative.
The key risk when lubricants are blended is a chemical reaction among the oil additives. In rare, desperate situations where no suitable replacement is available, some amount of synthetic and mineral oils might be combined. Undesirable outcomes from such mixing include precipitation and foaming. These issues do not appear instantly, but they can gradually reduce compression and power, eventually leading to costly engine repairs.
The expert explained that there are several scenarios in which a vehicle owner might consider mixing engine oils. For instance, when the oil level drops during a trip, a quick top up may seem necessary. In such cases, adding an unfamiliar oil might be tolerated temporarily, but a full oil change and new filters should be performed as soon as possible at a service station.
Before the next service deadline, the oil level may need to be reassessed and the oil changed again to restore proper physical and chemical properties within the engine. The emphasis is on maintaining consistent lubrication quality to protect engine components and prevent longer term damage.
In related automotive guidance, a former vice president of a national automobile association noted that automatic transmissions with a torque converter require careful handling. Mechanical strain from towing and aggressive acceleration can place unusual demands on the transmission, underscoring the importance of proper maintenance practices for overall vehicle longevity. This insight aligns with broader recommendations on avoiding sudden loads and ensuring regular service intervals to keep both engine and drivetrain functioning smoothly.
Overall, owners should prioritize using the correct oil specification for their engine and follow the manufacturer’s oil change intervals. When in doubt, consulting a qualified technician for a precise specification and service plan is the safest course. Proper oil management supports engine efficiency, protects moving parts, and extends the life of critical components in modern vehicles. The goal is steady performance, reliability, and cost-effective upkeep over the life of the car.