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Forum: Engines and Propulsion Systems

08-06-2022, 12:03

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

Great article on how diesels loose oil pressure. You’ll note debris is the number one reason.

https://www.capitalremanexchange.com/7-reasons-for-low-oil-pressure/

Forum: Engines and Propulsion Systems

08-06-2022, 11:55

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

Nice explanation Bongo thank you.

I think the worst thing to do is put a boat away for the winter without changing the oil.
You’d hope the drop in pressure is the oil pump swelling or something...

Forum: Engines and Propulsion Systems

08-06-2022, 08:56

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

It’s real easy if the label says “ C” you can use it on compression motors. If it has “S” it’s for service or spark. Don’t use S in diesel. Better yet don’t use C in a gas motor it can’t push the...

Forum: Engines and Propulsion Systems

08-06-2022, 07:05

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

I agree with both of those comments. Oil sounds like the least of the problems. Best place to loose oil pressure is in or around the pump. Sure fire loss of oil pressure is crank slapping around. A...

Forum: Engines and Propulsion Systems

08-06-2022, 06:04

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

Synthetic oil doesn’t take prisoners. If there is a spot to leak it seems to find it.
If the motor is clean gaskets are tight go ahead. It clings to metal rejects contaminates like no other oil....

Forum: Engines and Propulsion Systems

08-06-2022, 05:42

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

Did you know the Toronto Star did an independent test on motor oil 2 decades ago. They tested oil to SAE standards at 5,,000 miles. Castrol, Quaker State, Mobile passed. Shell Exon failed with 20...

Forum: Engines and Propulsion Systems

08-06-2022, 05:24

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

We packaged hypoid 80/90 as motorcycle fork oil in 1/2 pints for 10X the price
Vedoil muktigrade for marine for more dollars than a much better GTX.
We packaged BMW oil which was GTX they sold...

Forum: Engines and Propulsion Systems

08-06-2022, 04:42

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

Some folks contribute some folks talk smack.
Castrol GTX is awesome. It was originally designed to protect engines which just lost the lead in Gas. I worked for Burma Oil ( Castrol ) when it was...

Forum: Engines and Propulsion Systems

07-06-2022, 05:12

Replies: 37

Old engine: 30 weight or 40?

Views: 4,015

Posted By Rumrace

Re: Old engine: 30 weight or 40?

Oil like many things has made a leap forward. On an older engine like yours I would specifically use Quaker State High Milage 10w 40. This oil is wonderful for restoring old engines.
That said you...

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