(a)

1. (1) Oil filter with replaceable element shall be provided and connected by flexible oil lines if it is not of built-in or engine mounted design.
2. (2) Oil filter shall have a capacity of at least one quart (1 qt.).

(b) Engine (gross) horsepower (h.p.) rating.

1. (1) Two hundred horsepower (200 h.p.) minimum for twenty-five to seventy-eight (25-78) passengers.
2. (2) Two hundred forty horsepower (240 h.p.) minimum for seventy-nine to ninety (79-90) passengers (two hundred fifty horsepower (250 h.p.) minimum with air conditioning).