service bulletins - OilSpec Guide

OEM Approvals

Service Bulletins vs Manuals: Which One Wins for Oil Specs?

Oil specifications are critical, but which source—service bulletins or manuals—takes precedence? Discover the key insights that can impact your maintenance decisions.

OilSpec Guide Team
March 4, 2026

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Testing & Measurement

Fluid Contamination: The Quick Checks That Catch Big Issues Early

Primarily inspecting fluid color, clarity, and smell can quickly reveal contamination…

OilSpec Guide Team
March 23, 2026

Vetted

15 Best Heavy Duty Rotary Polishers for 2026

Great options await in our list of the 15 best heavy-duty rotary polishers for 2026,…

OilSpec Guide Team
March 23, 2026

Vetted

10 Best Drum Heater Bands for Motor Oil in 2026

Best drum heater bands for motor oil in 2026 offer safe, efficient heating…

OilSpec Guide Team
March 23, 2026

Label & Documentation

Why Some Labels List ACEA but Not API (and What That Suggests)

The reason some motor oil labels list ACEA but omit API ratings hints at underlying…

OilSpec Guide Team
March 23, 2026