Toro 8-32 with 8HP Briggs, using oil

Messages
75
Location
Littleton, MA
I bought a house and with it a Toro 8-32, I think from 1990. The engine is a 8HP Briggs & Stratton. I mow probably about an acre - maybe an hour and a bit total time. During this period the engine seems to burn oil - about 4 ounces based on the fact that the lower end of the dipstick range says "Add 8 ounces". I have been checking the oil when the engine is cold, and adding a bit before each time I use it. I'm using Castrol GTX 5w-30, although I also added a bit of Rotella T Synthetic 5w-40 when I didn't have any of the Castrol. There is no visible blue smoke when mowing, but if I let the mower idle for a bit it'll puff a bit as it idles - and a bigger puff of blue smoke when I rev it back up to mow. Is this a normal amount of oil consumption for this engine? Any comments on choice of oils? I'm also running a bit of seafoam in the gas right now to clean out the carb.
 
Last edited:

JTK

Messages
13,153
Location
Buffalo, NY
Looks like a good old mower! Given the vintage and what you describe, I'd run the least expensive house brand 15w40 I could find. No sense in blowing $ synthetics out the exhaust. Joel
 

spinfire

Thread starter
Messages
75
Location
Littleton, MA
Yeah - it is a workhorse. It was "as is" with the blade bent from hitting a rock. I put a new blade on and it works great. I'm running the Castrol GTX because I have a ton of it. I put the Rotella in before we'd moved to the property and I happened to have Rotella in my trunk. The manual recommends 5w-30 during winter months and straight 30 weight in the summer. But you recommend the much thicker 15w-40... is that just because of the age? Any concerns running the thicker oil?
 

JTK

Messages
13,153
Location
Buffalo, NY
The thicker viscosity range will tend to blow past the piston less than a 30wt, thus less oil consumption. I wouldn't run it for cold weather starting, but with a mower that's usually a non-issue. Joel
 
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