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Briggs engine - no oil change.

Just bought a new mower. It has a B&S 650 EXI engine that according to briggs never needs the oil changing, just topping up as needed. How does that work, surely the oil loses effectiveness over time? Can't find any info on their website about why the oil never needs to be replaced. Does anyone know what fiendish wizardry is going on in this engine? 

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  • PRO

    I just had a look up on this. I heard very little about it since it came out.


    Firstly I'm not sure it applies to commercial use. What they do is they have a few features which means the oil runs at a lower temp (air cooled engine oil runs hotter than oil in a water cooled system generally) so the oil takes much much longer to break down. Thus the thought with a mower than gets used 30 mins a week at most the rest of the mower will be useless before the oil has degraded sufficiently. If it was on my own mower I'd still change it every 50 or so hours.

  • PRO

    If as they claim it does not need oil changes is it actually designed to allow the oil to be changed?


    EXi Lawn Mower Engine Innovations | Briggs & Stratton
    We developed the first walk-behind mower engines that never need an oil change with our EXi Series – Just Check & Add™, never change the oil – ever.
    • PRO

      Yes it still has a dipstick. Just pour it out from there.


      EXi Lawn Mower Engine Innovations | Briggs & Stratton
      We developed the first walk-behind mower engines that never need an oil change with our EXi Series – Just Check & Add™, never change the oil – ever.
  • PRO

    I bought one of those oil removal pumps from Screwfix, basically a big syringe to suck oil out of small engines, the seals are not good enough and it only sort of does the job.


    • I use one of those as well...... works brilliantly and so quick.... no mess either.  Mine came off Ebay rather than Screwfix..... about £6 I seem to remember.  I always tilt the machine slightly so that all the oil is under the dipstick hole and do it with the oil hot.... easier to suck out. . 


      • Been using a pump for a few years now. Because it's clean and quick Ive found I'm more likely to change the oil regularly. I'll be interested to see if the oil that comes out of this new engine later in the year is in a better state than oil from other engines. 

  • if you need to top it up there must be a filler cap as you will not top it up down the dip stick pipe 

    how it works i have no idea 

    • PRO

      How do you top the oil up on any other mower? I can't think of any mower I've ever owned that had a filler cap like a car just a dipstick. I've mostly only had honda engines though


      • PRO

        The oil filler/ dip stick is on the top on the opposite side to the petrol cap, so presumably you will have to flip the machine right over to stand a chance of draining the oil out of it. You can however stand the machine on end to store it, so that may not be out of the question.

        As an aside, many years ago when garages had attended service at the petrol pumps I checked the oil in my mothers’ car at home, she asked how I had done it asking “do you have one of those dip sticks like Stan has at the garage?”.

        Younger folks may not get that. 

        Back in the days of attended service at petrol stations the petrol pump filling handsets had a latch on them that allowed you to walk away whilst the tank was filling and would stop filling when the tank was full. This allowed Stan to flip the bonnet open, which wasn’t locked, then check the fluids and add oil, screen wash and brake fluid onto the account sheet before my mother signed it. Blowing the tyres up was included as well as a free gesture of goodwill.

        Hence my mother did not know that each car engine has its own dip stick, she thought it was something Stan kept at the garage.

        The last garage I saw like this was on the Stratford upon Avon Road In Hockley Heath serving the the ladies of Warwickshire in their rag top Mercs and the like when their husbands chauffeur wasn’t to hand to take the car to the garage for them.



  • I noticed this a while back in my local machinery shop, I mentioned it to the chap who runs the place and he actually hadn’t noticed the change in engine spec that the manufacturers made. I wondered if it was a similar system to my 30y/o Land Rover, where you never actually change any oil, you just top up what has leaked out over the week - this providing a constant supply of clean engine oil. Very clever stuff.

    Anyhoo, first thing he did was go around the showroom and remove all the offending stickers. He didn’t want to be liable for new owners neglecting services and he didn’t want to miss out on the lost earnings from reduced oil changes!

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