Syn oil- company sez use regular interval

Joined
Jan 17, 2003
Messages
3,463
Location
Coastal South Carolina
Not a car but a mower- why does brigs/stratton say if you use syn oil you have to use the same change interval as dino oil? odd to me- I thought syn let you extend the interval??? Whats different about mowers?
 
Joined
Nov 17, 2002
Messages
3,023
Location
USA-Michigan
Because not all synthetic oils are the same and it difficult to control how this type equipment is used or abused. For the OEM its best to stick with one recommendation and not give the customer an excuse to collect on some warranty.
 
Joined
May 27, 2002
Messages
14,013
Location
Retired | Wausau, WI
Plus if you talking about regular walk behind mowers, it only holds about 20 oz of oil and works in the nastiest environment you can ask for.
 
Joined
Oct 30, 2002
Messages
41,253
Location
Great Lakes
 Originally Posted By: edwardh1
Not a car but a mower- why does brigs/stratton say if you use syn oil you have to use the same change interval as dino oil? odd to me- I thought syn let you extend the interval??? Whats different about mowers?
I don't know about your mower, but the instruction manual for my mower (also has a B&S engine) has the interval expressed in time, not miles or hours. Specifically, it says to replace the oil once a year. Basically, oil degrades over time, regardless if it's mineral or synthetic, so that's why they want you to periodically change it, no matter what oil. It's no different with cars - most manufacturers, even if they allow longer intervals (in miles) on synthetic, will still require you to have it changed at least once a year, regardless of miles.
 
Joined
Mar 17, 2008
Messages
7,257
Location
Michigan
Most Syn oils are not Long OCI oils. If they are the manufacturer will say it is good for X amount of miles. What the manufacturers say is that you will get more benefits running it for X amount of miles than you will a dino oil.
 
Joined
Aug 21, 2008
Messages
25,051
Location
ON, Canada eh?
 Originally Posted By: edwardh1
Not a car but a mower- why does brigs/stratton say if you use syn oil you have to use the same change interval as dino oil? odd to me- I thought syn let you extend the interval??? Whats different about mowers?
Because of the following: -No oil filter to filter junk out of the oil -Engine is Air/Oil cooled -Engine doesn't have controls in place to keep fuel dilution to a minimum (NO EFI/02 Sensor etc) -Engine has a small sump of oil
 
Joined
Jun 8, 2008
Messages
30
Location
Zephyrhills, FL
You also don't drive your car in a cloud of dirt but when mowing they are in dirt all the time. Some manufacturers will allow a longer interval with synthetic oils but I still stick to 25 hours with my equipment running the Amsoil formula 4 stroke and wix oil filters.
 
Joined
May 6, 2008
Messages
549
Location
New Mexico, U.S.A.
Perhaps they're trying to avoid a mower going multiple years without the owner checking the oil at all. Synthetics may be great, but not if there isn't any left in the engine.
 
Joined
Aug 21, 2008
Messages
25,051
Location
ON, Canada eh?
 Originally Posted By: tamadrummer
You also don't drive your car in a cloud of dirt but when mowing they are in dirt all the time. Some manufacturers will allow a longer interval with synthetic oils but I still stick to 25 hours with my equipment running the Amsoil formula 4 stroke and wix oil filters.
Good point, also they use substandard sponge style air-filters without the same type of rating as one you would use in your car. \:\!
 
Joined
Jun 23, 2009
Messages
107
Location
Michigan
 Originally Posted By: StevieC
 Originally Posted By: tamadrummer
You also don't drive your car in a cloud of dirt but when mowing they are in dirt all the time. Some manufacturers will allow a longer interval with synthetic oils but I still stick to 25 hours with my equipment running the Amsoil formula 4 stroke and wix oil filters.
Good point, also they use substandard sponge style air-filters without the same type of rating as one you would use in your car. \:\!
What are motocross and baja racers using for an air filter in extreme dusty conditions? the paper filters you buy at the corner auto parts store?
 
Last edited:
Joined
Jul 20, 2008
Messages
931
Location
Michigan
Yes... Briggs says not to extend oil if using a synthetic. 25 hrs severe service/hot weather and 50 hrs normal service. Another reason is large tolerances and gasoline contamination is common in many small engines.
 
Last edited:
Joined
May 1, 2006
Messages
421
Location
New Brunswick, Canada
Most oil manufatcures and vehicle manufacturers recommend the same change interval for synthetic and dino oil. Simply because the engine doesn't decide to dump less contaminants into the oil because your spending more money on it.
 

FZ1

Joined
Feb 7, 2008
Messages
4,862
Location
Texas
That's right. It ain't the oil;It's what's in the oil that needs to be dumped.
 
Top