What size is the oil drain bolt on a Lexus?
There isn’t a single universal size for every Lexus. In practice, most Lexus engines use a drain plug that accepts a 12 mm or 14 mm hex/socket, and the thread is commonly metric, such as M12x1.25 or M14x1.5. For exact specifications, consult the owner’s manual or the service manual for your specific model and year, or inspect the plug you’re working with.
Why the size varies by model and year
Lexus builds vehicles on several platforms with different engine designs, oil pans, and fastener specifications. The drain plug size can change between sedans, SUVs, hybrid versions, and across generations. To ensure a proper fit and seal, manufacturers publish model- and engine-specific specs that may differ even within the same model line.
Common sizes you may encounter
Oil drain plug dimensions fall into two general categories: the hex head size that fits a wrench and the thread size that seals into the oil pan. Here are the sizes you are most likely to see on Lexus models.
- Socket/head size for the drain plug: typically 12 mm or 14 mm.
- Drain plug thread size: commonly M12x1.25 or M14x1.5.
Because variations exist across engines and generations, always verify against your specific vehicle’s documentation or the plug itself.
How to verify the exact size for your Lexus
To determine the precise drain plug size for your exact car, use these steps.
- Check the owner’s manual or service manual for the recommended oil drain plug specification for your engine and year.
- Inspect the current drain plug: measure the hex head with a caliper or a known-wrench gauge to identify whether 12 mm or 14 mm fits snugly.
- Measure the thread pitch and diameter: use a thread gauge or compare with a known M12x1.25 or M14x1.5 plug; if in doubt, bring the plug to an auto parts store for exact matching or consult the dealer’s parts diagram.
- When replacing, use the appropriate crush washer or gasket and follow the manufacturer’s torque specification from the manual.
After confirming the size, you can proceed with the correct plug and torque to avoid leaks or damage.
Summary
The oil drain plug size on a Lexus is not universal and depends on your specific model and year. Most commonly you’ll encounter a 12 mm or 14 mm hex head and thread sizes around M12x1.25 or M14x1.5, but always verify with the manual or by inspecting the plug on your car. If you share your exact Lexus model and year, I can provide a precise size reference for that configuration.
