View Full Version : What weight engine oil?

03-26-2008, 07:47 PM
Please let's not turn this into a discussion about synthetic vs. conventional oil. In fact I would rather that not be brought up at all. I am just curious what weight oil you run in your mowers and other small 4-cycle engines.

Does the number of hours on the engine have any bearing on what weight of oil you chose to use?

03-26-2008, 07:53 PM
strictly 10w 30 we change the oil on our machines weekly, so we do not worry about oil break down

03-26-2008, 08:02 PM
strictly 10w 30 we change the oil on our machines weekly, so we do not worry about oil break down

omg! weekly? I use 10w 30 mobile one synthetic and change every 100 hours. One mower gas has run great since 1999 and one diesel that has run great since 1981 lol
Whatever floats your boat but it seems excessive--unless you put 50 or 100 hours on a machine a week

03-26-2008, 09:45 PM
There are times when we may change once a week as well. IF everything is running for a 6 days at 10 - 12 hours, easy out and new back in. If change everything, we'll go thru 18 qts of oil, that is the small stuff. No diesel machines, no trucks.

D & J Lawn Care
03-26-2008, 09:49 PM
i just use moble 1 0-50wt full syst. so i only have to carry that oil for the engine and hydro

03-26-2008, 10:10 PM
I prefer 10w30 !!

03-26-2008, 10:18 PM
Use the wt the manufacturer recommends.
My Kohler uses 10w-30 I'll will probably switch to synthetic 10w-30
Briggs/Daihatsu strait 30w or multi viscosity synthetic

Of course synthetic is better. There are reasons different manufacturers call for a particular weight to be used.

03-26-2008, 10:53 PM
we run 10-30 in all commercial equipment. changed around 100 hours

Happy Frog
03-26-2008, 11:34 PM
10W30 for a simple reason: 10W30 oils are SAE30 compliant but offer better protection on cold starts.

03-27-2008, 12:01 AM
Mobil 1 10w-30

03-27-2008, 12:02 AM
Multi-viscosity oil have been found by Briggs and Stratton to increase oil usage above 40 f. On my particular engine anyway.

The two Cautions in my manual state:

Caution! The use of non-synthetic multi-viscosity oils (5W-30, 10W-30) in temperatures above 40F (4C) will result in higher than normal oil consumption. When using a multi-viscosity oil, check oil level more frequently.

The chart shows not to use multi-viscosity oils above 40f. This is from the factory instructions. Only synthetic multi-viscosity oil are approved by the chart above 40F.

Caution! SAE 30 oil, if used below 40F, will result in hard starting and possible engine bore damage due to inadequate lubrication.

Just quoting the Briggs manual. They are quite convinced you shouldn't use multi-viscosity oils in the big block Briggs I own unless they are Synthetic (above 40F).

Kohler and Kawasaki are a different story.

03-27-2008, 10:53 AM
I use 10w30 but im (looking) into avation oil it's designed for air cooled engines and its supposed to offer more protection the hotter it gets im just not sure yet how well its going to work but my concern is how well its going to work for start up on cooled off engines because it thicker that 10w30

03-27-2008, 11:17 AM
Until I can get over to the Amsoil warehouse, I am running Royal Purple 10w30 all my 4 stroke combustion stuff and until I run out my John Deere premium 2 cycle and then it will only be Stihl Ultra 2 cycle!

casey humphrey
03-27-2008, 11:23 AM
10 w 30 synthetic

General Landscaping
03-27-2008, 12:35 PM
Straight 30

Cold starts..... HA....not on the break between zones 9-10