OIL GRADE IN JET BOAT

Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

Just found an interesting result in oil pressure in my boat engine. I always used Kendall 20W-50 but found that the pressure droped back to around 40psi @ 100 dec C. Now using Castrol 10-60 Edge Synthetic and it now sits at 60psi. Guess that shows what synthetics can do over Dino!!.

7/3/102:06 AM

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papabearMember

"Guess that shows what synthetics can do over Dino!!."

What does that comment mean?

7/3/106:59 PM

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robertcMember

nothing to do with it.

The change from 50 to 60 might

7/6/105:46 AM

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lamontbdumontMember

Agreed RobertC - the comparison is only valid if the vis grades are identical. The second number relates to high temperature performance. He went to a higher VI that will give a higher viscosity at the same operating temperature. Higher viscosity = more resistance to flow = higher oil pressure, all other factors being equal.

7/7/103:58 AM

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