new 383...what oil

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swampthing3
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new 383...what oil

Postby swampthing3 » Tue May 14, 2019 10:24 am

Hi all. I got a boat with a fresh 383 on it that still has break in oil in it.

It has 23 hours on it. I want to change the oil. What would be a good weight/brand to run?

Thanks!

jamesskycop
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Re: new 383...what oil

Postby jamesskycop » Tue May 14, 2019 10:37 am

I like Royal Purple 10/40 full synthetic....

swampthing3
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Re: new 383...what oil

Postby swampthing3 » Tue May 14, 2019 11:17 am

What would be the advantage of synthetic over conventional? Extra heat and load being put on the engine?

Rich Andrews
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Re: new 383...what oil

Postby Rich Andrews » Tue May 14, 2019 11:54 am

might want to ask the builder of the motor the clearance specs before you go about putting oil in it...
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SWAMPHUNTER45
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Re: new 383...what oil

Postby SWAMPHUNTER45 » Tue May 14, 2019 12:32 pm

Rich gave you great advice. Look and see on your paper work if the seller provided any info on an oil requirement.

Is the engine roller or flat tappet?

YOU WILL DESTROY THE ENGINE IF IT IS FLAT TAPPET AND YOU FAIL TO PROVIDE AN OIL WITH ZZDP

swampthing3
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Re: new 383...what oil

Postby swampthing3 » Tue May 14, 2019 12:47 pm

I got the boat 3rd hand. I was told its roller.

That being said, I cant prove it without taking it apart. It runs perfect and want to continue that way. Just to be safe, should I run oil with zinc just to be sure? Is there a negative effect if its a roller lifter and I run the zinc oil?

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smokster
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Re: new 383...what oil

Postby smokster » Tue May 14, 2019 1:49 pm

cant go wrong with 10w 40 amsoil z-rod. thats what glen treadwell recommends for his motors even roller motors. use a good oil filter and change it about twice a year

swampthing3
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Re: new 383...what oil

Postby swampthing3 » Tue May 14, 2019 3:05 pm

been doing some reading, the Valvoline VR1 sounds like a good one. they have 10w-30 and 20w-50 synthetic. Not knowing the clearences exactly, would the thicker oil be a safer bet?

hdsadey
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Re: new 383...what oil

Postby hdsadey » Tue May 14, 2019 3:22 pm

I run Valvoline VR1 Racing 20w-50 on a direct drive solid flat tappet 408 Windsor. Joe Gibbs also makes flat tappet oils. I like conventional oils, no synthetics for me! Any idea what weight the break in oil is? 10 psi per 1k RPM is the general rule. If you know what's in there now and idle pressure, you can adjust with weight.
02 Predator 12' 0320 Lycoming
92 Big O 13' Ford 408 Windsor DD Dry Runnin MOFO!
99 Donzi 16 Classic 350 Vortec

swampthing3
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Re: new 383...what oil

Postby swampthing3 » Tue May 14, 2019 3:52 pm

Why do you like the conventional over synthetic?

current pressure at idle is just over 40 pounds

hdsadey
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Re: new 383...what oil

Postby hdsadey » Tue May 14, 2019 7:22 pm

Synthetics are designed for newer power plants in my opinion. They don't seem to get along with old style gaskets and like to leak. Just my opinion. LS is fine with synthetics but not old sbc's. 40 psi at an idle is WAY high for my liking. Probably has a high volume pump which is also not needed unless bearing clearances have been purposely opened up or worn out. I posted a thread awhile back about high volume pumps. Puts a lot of stress on distributor gear. If it was me I would swap the pump out for a standard volume pump, your engine will thank you in the long run.
02 Predator 12' 0320 Lycoming
92 Big O 13' Ford 408 Windsor DD Dry Runnin MOFO!
99 Donzi 16 Classic 350 Vortec

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dodobird
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Re: new 383...what oil

Postby dodobird » Tue May 14, 2019 8:02 pm

If flat tappet VR1 has high zinc I use 50w

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barhopper
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Re: new 383...what oil

Postby barhopper » Wed May 15, 2019 6:17 pm

Brad Penn 20 50 is my choice of oil. High zinc content.


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