There's no single "right" answer. Oil weight depends on several factors:
* Engine Condition: A worn-out engine may benefit from thicker oil to help seal gaps. A newer engine might prefer thinner oil for better flow.
* Climate: In hot climates, thinner oil is often preferred. In cold climates, thicker oil can help with starting.
* Driving Style: If you drive aggressively or tow heavy loads, a thicker oil may be beneficial.
General Recommendations:
* Modern Engine (Good Condition): 5W-30 is a common and versatile choice for modern 305s.
* Older Engine (High Mileage): 10W-30 or even 10W-40 can provide better protection against wear and tear in older engines.
* Extreme Climates: Adjust the weight accordingly. If you're in very hot weather, you might consider a 0W-30 or 0W-40. If you're in very cold weather, you might need a 5W-40 or 10W-40.
Always Consult Your Owner's Manual:
The best source of information for your specific engine is your owner's manual. It will usually have a recommended oil weight range.
Important Note:
Always use an oil that meets the API service classification for your engine.
