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post #1 of 6 Old 01-02-2015, 11:03 PM Thread Starter
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Vintage Briggs engine. What Oil?

10hp cast iron pre 1981 (its a 1977 Briggs engine-243431)..I know oil classifications since this engine was built are obsolete with today's modern oil..questions is do I need to worry about zinc (ZDPP) ppm?..would a modern synthetic work?..my gut is do what we have always done and use straight 30wt oil but I am a little worried about vintage Briggs engines needing some zinc..30wt Shell Rotella T is my go to oil as it does have 1200ppm zinc..any ideas on what to use?
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post #2 of 6 Old 01-03-2015, 12:40 AM
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Re: Vintage Briggs engine. What Oil?

Have you used Rotella T on old engines without first tearing them down to clean the decades of sludge out ? I would worry that the high detergent would put this stuff back into the oil.


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post #3 of 6 Old 02-23-2015, 07:25 PM
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Re: Vintage Briggs engine. What Oil?

Considering you can compress the valve springs with your fingers on any Briggs, Tecumseh/Lauson, Kohler I wouldn't worry about zinc



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post #4 of 6 Old 02-23-2015, 09:39 PM
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Re: Vintage Briggs engine. What Oil?

What yamaha said.
I have a supply of 15 wt full synthetic that we tested with the viscosity of 30 wt. at 212degrees- we run it in the go karts (clone motors/ run hard), I run it in my motors.

My pull start little plow tractor starts in the zero temps we have had.
I know the oil helps.

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post #5 of 6 Old 02-23-2015, 09:49 PM
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Re: Vintage Briggs engine. What Oil?

I've always gone straight to Rotella when I've purchased any equipment off of Craigslist. And ive had quite a few engines from the same time period of yours. I understand this can be a hotly debated subject, but I'm of the option there isn't a reason not to use detergent oil in 99% of engines out there. If you are concerned with too much sludge getting suspended in the oil, do a couple more rapid drain and fills.

I ran penzoil platinum once in a old Tecumseh snowblower I'd picked up off CL. The oil turned black in an hour or two of operation. Dumped that and the oil color acted more normal from that point on till I sold it a couple years later.
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post #6 of 6 Old 06-15-2015, 01:45 PM
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Re: Vintage Briggs engine. What Oil?

Quote:
Originally Posted by TWG1572 View Post
I've always gone straight to Rotella when I've purchased any equipment off of Craigslist. And ive had quite a few engines from the same time period of yours. I understand this can be a hotly debated subject, but I'm of the option there isn't a reason not to use detergent oil in 99% of engines out there. If you are concerned with too much sludge getting suspended in the oil, do a couple more rapid drain and fills.

I ran penzoil platinum once in a old Tecumseh snowblower I'd picked up off CL. The oil turned black in an hour or two of operation. Dumped that and the oil color acted more normal from that point on till I sold it a couple years later.
The PP was cleaning the engine sounds like. I would guess a non detergent oil would get black fast. Never ran it.

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Last edited by slomo; 06-15-2015 at 02:06 PM.
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