Valvoline Synchromesh Manual Transmission Fluid
The short answer
Valvoline Synchromesh is a manual transmission fluid sold in quart bottles. It is meant for manual gearboxes whose manufacturer calls for a synchromesh-type fluid. It is a suitable choice only if your owner's manual or service information specifies that type of fluid and the bottle's label lists the specification or approval your transmission requires. If your manual calls for something else, such as gear oil, automatic transmission fluid (ATF) or a manufacturer-only fluid, treat this product as unconfirmed for your vehicle until the label shows a matching specification.
What "synchromesh" refers to
Most modern manual transmissions use synchronizers, often called synchros. These are friction rings that bring a gear up or down to the right speed before it engages, so the gear can mesh without grinding. The fluid in the gearbox affects how those rings grip and release. A fluid with the wrong friction characteristics can make shifts notchy, slow or prone to grinding, even if it lubricates the gears adequately. That is why manufacturers name a specific fluid type instead of simply asking for any transmission oil.
Conditions that change the answer
Fluid specification: The deciding factor is the specification your manufacturer lists, not the word "synchromesh" on its own. Match the spec name or number in your manual to the one printed on the bottle. Model year, market and trim: The same model can use different transmissions, and therefore different fluids, depending on year, market and trim level. Confirm the fluid for your exact vehicle, not just the model name. Transmission type: Confirm the vehicle has a manual gearbox that calls for this fluid type. Automatic transmissions, CVTs, dual-clutch units, transfer cases and differentials often have their own fluid requirements and should not be assumed compatible. Gear oil requirements: Some manual transmissions specify a gear oil with an API GL rating and a viscosity grade instead of a synchromesh fluid. If yours does, use the type the manual lists rather than substituting. Warranty: If the vehicle is under warranty, using a fluid that does not meet the stated specification may complicate a claim. Check your warranty terms if this applies.
Is one quart enough?
Fill capacity varies by transmission, so a single quart may or may not be enough for a full drain and refill. Look up the capacity for your specific transmission in the owner's manual or service information and buy enough bottles to cover it, plus a little extra in case of spillage. A single quart is often enough for topping up after a small leak or a seal repair. Confirm the correct fill level and check method for your gearbox before adding fluid.
Gaps in the available information
No product data sheet, approval list, vehicle compatibility list, price or stock information was available for this article. Several questions therefore cannot be answered here: which manufacturer specifications the current formulation meets, its viscosity, the vehicles Valvoline lists it for, and current pricing or availability. Check the bottle label, the manufacturer's current product information or a parts retailer's fitment tool for these details.
Suggested next step
Find the transmission fluid specification and capacity in your owner's manual or service information for your exact model year, market, trim and transmission. Then compare the specification against the Valvoline Synchromesh label. If they match, buy enough quarts to cover the capacity. If they do not match, or the manual names a fluid the label does not mention, choose the fluid the manufacturer specifies or ask a dealer parts department to confirm compatibility.