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B&S V-Twin 725cc oil question #5425952 05/10/20 11:34 PM
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GMBoy Offline OP
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Got an older Craftsman lawn tractor that has had a diet of 10w/30 mobil 1 changed at 40-50hr intervals. It is the V Twin 725cc engine - good engine for sure! Anyhow, my son thought he heard rod knock and was worried. I listened and heard it too - it was bad so we did a quick oil change and this time put in Mobil 1 V-Twin 20w/50 that I use on the Harleys . Rod knock was still there - but it turned out to be the steering linkage loose and hitting the crank pulley making the noise.... So we are actually ok thank goodness! With that - would you guys leave the 20w/50 in there? I personally think it will be ok especially in Texas but I also know 10W/30 is the recommended oil.

Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5425956 05/10/20 11:41 PM
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tomcat27 Offline
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I used to run 30w in mine


2019 Cherokee, 2018 Jetta, 2014 Sentra, 2001 Camry, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300
Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5425962 05/10/20 11:58 PM
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jeepman3071 Offline
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20w50 won't hurt anything especially in Texas. Once it gets a bit cooler you might want to switch to the 10w30, but no sense in wasting good oil.


1998 Jeep Wrangler Sahara 4.0L/5MT (157k) - PHM 10w30, Wix 51085
2009 BMW 328i N51 (61k) - Liqui Moly 5w40, MANN HU816X
Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426013 05/11/20 05:36 AM
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Lubener Offline
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I would not run 10w-30 in my rider. Mine only gets straight 30 or 20w-50 for summer use. Has worked for me with Ohio's temperatures and I don't see the heat as you do in Texas.

Last edited by Lubener; 05/11/20 05:38 AM.

The "thinking" man's friend.
Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426023 05/11/20 05:59 AM
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Slick17601 Offline
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Mobil 1 10W-30 High Mileage is a solid choice for small engines.


2018 RAM Bighorn 5.7
2008 Toyota Sienna 3.5
Re: B&S V-Twin 725cc oil question [Re: Slick17601] #5426055 05/11/20 07:03 AM
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Lubener Offline
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Originally Posted by Slick17601
Mobil 1 10W-30 High Mileage is a solid choice for small engines.

For that older B & S, I will bet in the manual that SAE30 is the preferred weight to use, not 10w-30.

Last edited by Lubener; 05/11/20 07:08 AM.

The "thinking" man's friend.
Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426066 05/11/20 07:15 AM
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Eddie Offline
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I run 10w30 T5 synthetic blend in my B&S 20HP twin here in FL. But, 20-50 will do just as well in the summer heat in my opinion. I would go back to a synthetic 10w30 at the next scheduled oil change though. Ed


2014 CX5 Touring 2.5L :-)
Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426073 05/11/20 07:19 AM
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philipp10 Offline
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so you thought you had a rod knock and changed the oil? What did you think a thicker oil was going to do......???

Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426074 05/11/20 07:20 AM
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Yeah … air cooled and all … just be careful that it might pop a wheelie on ya now … 😷

FWIW: Just put Delvac 15w40 in my 19 HP Briggs and it’s never run better …

Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426305 05/11/20 11:37 AM
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dwendt44 Offline
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The lawn mowers and tractors we see here are all air cooled and oil temperatures can and
often do get up to the 250° and higher in the summer, especially in the southern tier of states.
Many commercial users go with a 15W-40 oil.

My 2¢


There's no such thing as:
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Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426364 05/11/20 12:38 PM
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CT8 Offline
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20W-50 works great in air cooled engines.


2015 F150 2.7
2018 F350 6.2
Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426453 05/11/20 01:49 PM
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thastinger Offline
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I run Mobil 1 Euro 0-40 in my 27HP B&S and my 17HP Kawasaki mower engines

Re: B&S V-Twin 725cc oil question [Re: philipp10] #5426877 05/11/20 10:11 PM
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GMBoy Offline OP
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Originally Posted by philipp10
so you thought you had a rod knock and changed the oil? What did you think a thicker oil was going to do......???


Thicker oil can lessen the noise.

I really was draining the oil looking for metal - there was none.

Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5426879 05/11/20 10:12 PM
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GMBoy Offline OP
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Thanks for the helpful feedback from most of you. I plan on running that oil for the 50 hr interval.

Re: B&S V-Twin 725cc oil question [Re: GMBoy] #5427184 05/12/20 09:46 AM
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bchannell Offline
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I had a 27hp Briggs in my "extra" tractor a while back and used M1HM 10w30 and it seemed like a great choice. I think those bigger engines like some sort of 30wt oil whether it be straight 30 or multi vis.
In modern OPE engines, I don't think you'd ever go too far wrong using a good HD 10w30 oil. Is it the best you could ever use, probably not, but I'm betting you'd never know the difference in this lifetime.

Last edited by bchannell; 05/12/20 10:12 AM.
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