What Causes Oil Burning in the Highlander?
2 Answers
Highlander naturally aspirated oil burning reasons are as follows: 1. Using inappropriate engine oil (0w20 oil) or overdue maintenance/neglected maintenance (oil light only comes on when oil pressure is insufficient, oil pump cannot draw); 2. Aging valve stem seals. Below is extended information about the Highlander: 1. The 2.7L inline 4-cylinder engine adopts dual VVT-i and variable intake manifold length system, with maximum power of 140kW/5800rpm, peak torque of 252N·m/4100rpm, and maximum horsepower of 188hp. 2. The 2.7L model leans towards fuel efficiency, this straight-four dual VVT-i engine coded 3AR-FE has obvious characteristics of high torque at low speeds.
As an enthusiast who frequently works with the Highlander model, I've noticed that oil burning issues are quite common, mainly due to several typical reasons. Worn or damaged piston rings are the primary culprit—when these fail to seal properly in the engine, oil leaks into the combustion chamber and gets burned. Aging valve stem seals are another frequent issue, especially in vehicles with high mileage or delayed maintenance. I recall some Highlander owners experiencing rapid oil consumption during long-distance drives, with blue smoke possibly appearing from the exhaust, indicating oil entering the exhaust system. Prolonged neglect can lead to engine carbon buildup, reduced power, increased fuel consumption, and in severe cases, major overhauls. I recommend regularly checking the dipstick to monitor consumption—if it exceeds one liter per 1,000 kilometers, it's time to be concerned. This issue is more prevalent in certain Toyota engines from specific years, such as older V6 models, and repairs can be costly. It's best to get an early inspection at an authorized service center to prevent minor issues from escalating into major problems.
