Briggs 4PK Vanguard 15W-50 Heavy Duty Synthetic Oil 5-Quart 100170

I use this on my Ferris mower for commercial work and have been doing oil changes with it for several years now. My dealer pointed me toward this oil and I've never had a reason to switch. When you're running a mower hard professionally, you don't want to mess around with what goes in the engine. This oil has never let me down — consistent performance change after change, and the engine runs exactly how it should. If you have a Ferris with a Briggs & Stratton engine and you're not sure what oil to use, I'd say talk to your dealer — and don't be surprised if this is exactly what they recommend too.

I’ve been using the Briggs & Stratton 100170 Vanguard 15W-50 Heavy Duty Synthetic Oil in my equipment for a while now, and I am incredibly impressed! This oil provides outstanding engine protection, even under the toughest working conditions. I’ve noticed a significant improvement in engine performance—smoother starts, quieter operation, and overall better fuel efficiency. It’s specifically designed for heavy-duty use, and it really shows in how well it performs in my lawn mowers, generators, and other power equipment. The synthetic formula makes this oil incredibly durable, and I’ve experienced less wear and tear on my engines compared to regular oils. The 5-quart size is perfect for those larger engines, reducing the number of refills needed. This oil really helps extend the life of my machines, and I feel confident that I’m getting the best protection for my investment. If you’re looking for a high-quality, long-lasting oil for your heavy-duty equipment, I highly recommend the Briggs & Stratton Vanguard Synthetic Oil.

Best price i could find for the 37hp big block on my mower. This is on the factory list for best lubrication in a large temperature range. It works and is high quality. I think I may go with a slightly thinner oil after the warranty is up. Should get better fuel efficiency out of 10w40. The engine should run plenty col with thinner as well.

Excellent oil for Vanguard engine.

Great oil for the RZ 142 Stihl Zero turn

This was a great product at a reasonable price. The only problem I had was when I opened the box. There was a little bit of oil in the box and on the packaging. It seems like the bottle was leaking from the cap not enough for me to send it back, but enough for me to not buy from the same seller again it was a nice amount of oil, but like I said not enough for me to send it back .

The only oil specified for use in my Grasshopper Mower to maintain the warranty. Arrived way faster than I expected and ON SALE at this time of year so I ordered TWO just to be prepared for next year's mowing season. Having the right oil and filters specified by Grasshopper preserves my expensive equipment. Because this oil is 100% SYNTHETIC it runs clean and lasts beyond recommended oil change intervals. It is one less worry for me and that's priceless.

Great product for a good price