Four Wheel Logic

You can tell what transmission you have by using your owner’s manual, factory labels, and a VIN decoder to match the exact gearbox code.

To tell what engine you have, match your VIN, under-hood labels, and paperwork with an engine code from a reliable decoder or manual.

You can tell a transmission is slipping when engine revs rise without matching speed, shifts feel lazy or harsh, and you notice a burnt smell or warning light.

You can find what year your car is by reading the VIN, checking paperwork, and matching build labels with model year guides.

You can find your car trim by checking the VIN, door jamb label, original window sticker, and digital tools from your automaker or insurer.

Check the owner’s manual, VIN sticker, or transmission pan shape to confirm the exact transmission in your vehicle.

To find what engine your car has, use the VIN, under-hood labels, paperwork, or trusted online decoders to read the exact engine code and size.

You know it is time to replace spark plugs when mileage nears the service interval or you notice misfires, hard starts, rough idle, or rising fuel use.

You know it is time to change spark plugs when mileage, dashboard warnings, and engine behavior line up with your manual’s service interval.

You know a car is likely totaled when repair costs plus salvage value reach or exceed the vehicle’s actual cash value under your insurer’s rules.