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Old 09-28-2015, 04:48 PM   #1
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Oil for Lehman SP135 ?

What do folks recommend as the best engine oil for the Lehman 135?
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Old 09-28-2015, 04:59 PM   #2
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Straight 30w, 40w or 15-40w.

Truth is you could pretty much put most any weight oil in a Lehman and it'll run on it for ever.
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Old 09-28-2015, 05:07 PM   #3
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Not wanting to hijack Davids question but can I add detergent oil or non detergent oil
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Old 09-28-2015, 05:36 PM   #4
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detergent is way better in a diesel. It helps clean the rings of soot and what not.
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Old 09-28-2015, 05:38 PM   #5
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Quote:
Originally Posted by Capt.Bill11 View Post
Straight 30w, 40w or 15-40w.

Truth is you could pretty much put most any weight oil in a Lehman and it'll run on it for ever.
We ran 30w in the PNW and then switched to 40w when we got south but as Bill says anything will work.
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Old 09-28-2015, 05:58 PM   #6
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Greetings,
Mr. wb. My Lehman 120 manual advises single grade oils of varying weights depending on temperatures. I'm currently using Rotella 30W.
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Old 09-28-2015, 07:34 PM   #7
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Quote:
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Greetings,
Mr. wb. My Lehman 120 manual advises single grade oils of varying weights depending on temperatures. I'm currently using Rotella 30W.
My October 1978 L120 Manual recommends a range of single viscosity oils between 10W and 40 depending on ambient operating temp and engine speed. And for multi viscosity oils it specifies:
< 32F- 5W-30
-10 to 90- 10W-30
-10 to 90 or above- 10W-40
> +10- 20W-40
I use 10-40.
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Old 09-28-2015, 09:20 PM   #8
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I try to minimize the amount of viscosity improvers by using none.

I use Delo 30W except in mid summer then 40W. If I had a turbocharger lubricated by engine oil I'd 15W 40 synthetic blend. Change oil often. Mostly re time except on a long trip.
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Old 09-28-2015, 10:22 PM   #9
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Straight 30 or 15-40. Definitely want detergent oil.

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Old 09-28-2015, 10:26 PM   #10
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Correction to 7 above. I use 15-40.
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Old 09-29-2015, 02:07 AM   #11
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15w40.
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Old 09-30-2015, 12:46 AM   #12
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I use Rotella 30W.


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Old 09-30-2015, 05:20 AM   #13
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Old 10-01-2015, 05:47 PM   #14
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Quote:
Originally Posted by Capt.Bill11 View Post
Straight 30w, 40w or 15-40w.

Truth is you could pretty much put most any weight oil in a Lehman and it'll run on it for ever.
Yep.

I've noticed that the stores that sell large quantities, like 1 and 2.5 gal, in the south it's all straight weight and in New England it's all 15-40.

So I go with what the local are using and have been using 15-40 for the last 8,000 miles.

Once I get into a hot climate again, may go back to straight 40w, but then may not.

While the engine has not changed in 40 years, nor the manual, the data has shown that multi weights have more advantages than disadvantages for all engines.
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Old 10-01-2015, 06:37 PM   #15
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Thanks for all the input everyone. FWIW I have settled on Rotella T 15-40. Cheers.
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Old 10-01-2015, 06:57 PM   #16
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In FL I use Rotella 40 non detergent...straight.. If I go north I will adjust.
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