Mobil Extra 4T 10W-40 combines a unique blend of high quality mineral and synthesised hydrocarbon baseoils together with an advanced additive system to provide excellent engine cleanliness, wear protection and effective corrosion. Key features and benefits include: Features, Advantages and Potential Benefits Excellent wear protection Longer engine component and overall engine life Good thermal , oxidation stability and deposit control Cleaner running engines resulting in smooth flawless operation Excellent corrosion protection properties Longer life of valve train and bearing components Enhanced low temperature properties Easier cold weather starting, longer electrical system life