Heavy-duty diesel oil that offers strong fuel economy benefits without sacrificing engine durability.
SynShield® Ultra Performance 10W-30 Engine Oil is a premium advanced performance, synthetic plus, heavy-duty diesel engine oil formulated to provide maximum protection against wear, oxidation, deposit formation, soot contamination and aeration.
Exceeds API Service Categories for heavy-duty-diesel engine oil: CK-4, CJ-4, CI-4, CI-4 Plus and older.
Premium Oil Filter
Doc’s premium oil filters remove dirt and debris from engine oil, ensuring peak engine health and better fuel efficiency. Regular replacement maintains smooth engine operation and prevents overheating. Compatible with synthetic, conventional, and blended oils, our filters use high-flow synthetic media with robust metal housing for a longer lifespan and superior contaminant capture. All Doc’s oil filters are designed to meet or exceed OEM requirements!
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