We Tested 4 Fuel Additives on Carbon Buildup: Before and After Borescope Logs
Four 2016 Chevrolet Equinox 2.4L Ecotec engines came through our shop in the same month, all with the same complaint: rough idle, occasional hesitation, and a subtle loss of throttle response. All four had between 62,000 and 71,000 miles. All four had direct injection. We borescoped the intake valves on all four engines before any […]
We Tested 3 Foam Engine Cleaners on Heavy Oil Sludge: Valve Cover Teardown Results
A 2005 Toyota Camry with the 3.0L V6 1MZ-FE engine arrived at our shop after a purchase inspection request. The buyer wanted to know the engine condition before finalizing the sale. Oil change records showed intervals of 8,000 to 12,000 miles over 148,000 miles of ownership. We removed both valve covers before any treatment and […]
We Ran a Car With 1 Quart Low Oil for 1,000 Miles: Wear Metal Lab Results
Most people know that low oil is bad. Very few people know exactly how bad, how quickly, or which specific engine components pay the price first. We ran a controlled test on a 2014 Honda Accord with the 2.4L K24W engine at 78,000 miles: 1,000 miles at factory fill (4.4 quarts), 1,000 miles with exactly […]
Why This Customer’s Electric Parking Brake Stuck On: A Plastic Actuator Gear Teardown
A customer called from a parking garage at 7:45 in the morning. His 2018 Volkswagen Tiguan had not moved. He had applied the electric parking brake the night before, returned in the morning, released it from the dashboard switch, and the car still would not roll. The dashboard showed an EPB fault light and a […]
We Drove a Car on 3 Cylinders for 300 Miles: Exact Catalytic Converter Damage Log
A 2010 Hyundai Sonata 2.4L came in with the check engine light on and a rough idle the owner described as ‘manageable.’ He had driven the car approximately 300 miles after the light illuminated, because the car ‘still got him where he needed to go.’ The misfire code was P0302: cylinder 2 misfire. The cause […]
Why This Car’s AC Blew Hot Air at Red Lights: A Condenser Fan Motor Current Drop Audit
A 2015 Hyundai Sonata came in with an air conditioning complaint that followed a very specific pattern: cold air at highway speeds, progressively warmer air as speed decreased, and clearly hot air after sitting at a red light for more than 60 seconds. The moment the car started moving again, the AC recovered. The pattern […]
Silicone vs Petroleum Grease on Slider Pins: 15,000-Mile Caliper Pin Rubber Swelling Test
We installed new brake calipers on 4 identical 2018 Toyota Camry test vehicles at the same time. Two received slider pins lubricated with silicone-based brake caliper grease, which is the correct specification. Two received slider pins lubricated with petroleum-based multi-purpose grease, which is what we routinely find when customers bring cars in for brake complaints […]
Cheap vs Name Brand Cabin Air Filters After 10,000 Miles: Airflow and Mold Spore Test
We installed three different cabin air filters on three identical 2019 Honda CR-Vs in the same climate zone at the same time and documented their condition after 10,000 miles of use. The three filters were a $6 generic Amazon filter with no brand name, an $18 Bosch Workshop Cabin Air Filter, and a $35 Mann+Hummel […]
How Automatic Car Washes Cause Swirl Marks (and How to Fix Them)
Every car owner loves the convenience of a quick drive-through car wash. It takes less than five minutes, costs very little, and leaves your vehicle looking clean from a distance. However, when you pull into the sunlight, you might notice something disheartening: a web of fine, circular scratches covering your beautiful paint. These are known […]
We Bought 5 Junk Cars With Broken Timing Belts: Bent Valve Damage Inspection Log
We sourced 5 junk vehicles with confirmed timing belt failures over a 4-month period, all with interference engines. Interference engines are the majority of modern vehicle engines: the pistons and valves occupy the same space at different points in the rotation cycle. When the timing belt breaks in an interference engine, the piston and valve […]