Some Toyota RAV4 owners report experiencing white or gray smoke emissions following an oil change, particularly after an overfill issue. This white smoke may indicate condensation in the exhaust system or more serious concerns such as a leaking intake manifold gasket, bad EGR cooler, blown head gasket, or cracked cylinder head. Additionally, gray smoke can signal abnormal exhaust emissions, suggesting that the engine is not functioning properly. Overfilling the oil during an oil change can lead to excess oil burning off, contributing to smoke production. Owners may notice that the smoke occurs intermittently, especially when the engine is warm, and could also experience odd smells, occasional DPF warning lights, or large clouds of smoke after extended driving. It is advisable for affected owners to consult a qualified mechanic for diagnosis and necessary repairs.

The Ford Explorer with the optional 5.0L/302ci V8 may develop misfires, rough running, and loss of power, accompanied by the check engine light illuminating. Ignition wires can rest on the exhaust manifolds if they are not properly secured. The hot manifolds will melt the insulation on the wires, damaging the wires and causing the mentioned condition. Replacement of the ignition wires, and securing them away from the exhaust manifold is necessary to remedy the rough running conditions.