Volvo Penta Coolant VCS (yellow) contains new inhibitors that are adapted to the materials used in modern engines. VCS (yellow) offers improved protection against corrosion and the build-up of deposits. It helps counteracts cavitations and galvanic corrosion. The change interval is 4 years for VCS yellow coolant
Do you have a faulty Volvo Penta MDI unit? This is the latest design Volvo Penta MDI unit for D1 and D2 compact diesel engines. If your D series, starts but won't stop, won't start or cuts out underway, or shows signs of fuel starvation or symptoms similar to an air leak on the fuel system, then the MDI may be the issue.