Is Castrol Magnatec Synthetic or Part-Synthetic?
Castrol Magnatec 5W-30A1 and Castrol Magnatec Diesel 5W-40 A3/B4 are fully synthetic formulations providing quicker circulation at extremely cold temperatures and superior performance at high operating temperatures. Castrol Magnatec 10W-40 and 15W-40 are both part-synthetic. All grades of Castrol Magnatec contain Intelligent Molecules that cling to critical engine parts to instantly protect from the moment you turn the key.
