Wood vinegar is a byproduct from charcoal production. It is a liquid generated from the gas and combustion of fresh wood burning in airless condition. When the gas is cooled, it condenses into liquid.Raw wood vinegar has more than 200 chemicals, such as acetic acid, formaldehyde, ethyl-valerate, methanol, tar, etc.ood vinegar is safe to living matters in the food chain, especially, insects that help pollinate plants. Wood vinegar is made from burning fresh wood in a charcoal kiln, made from a 200-liter oil drum and 120-cm-tall concrete chimney with a 4-inch diameter. The kiln contains 63-83 kg of fresh wood.
The average cost for an Audi A4 Serpentine Belt Replacement is between $80 and $144. Labor costs are estimated between $61 and $78 while parts are priced between $19 and $66. Estimate does not include taxes and fees.
1 Parts typically cost $25-$80 or more for just the timing belt, depending on vehicle make and model; or $100-$800 or more for a kit that also includes other recommended replacement parts like seals, the tensioner or a water pump.2  CostHelper readers report. Having a mechanic or repair shop replace the timing belt (and possibly the serpentine belt and accessory belt at the same time) can cost $150-$1,000 or more, depending on the make, model and type of vehicle.