One last note — we've linked five-quart jugs of 5W-30 Full Synthetic oil ... temperatures. Castrol's focus — at least in its marketing — is on making a motor oil that's designed primarily ...
BEST OVERALL: Pennzoil Platinum Full Synthetic 5W-30 Motor Oil ↓ ... protect engines and improve performance, this 5W-30 Castrol GTX motor oil features Castrol’s sludge and wear protection ...