My EU's have always run synthetic oil. And, even though I change the oil frequently enough, sometimes I 'exceed' Honda's interval and don't worry about it since the synth should last longer than conventional. Like someone wants to change their generator oil half-way thru a power outage caused by a hurricane, tornado, or blizzard? 100hrs is just over 4-5 days(should cover most outages). Been without power for 2-3 weeks several times and have enough going on to add more chores and will run the synth to 150-200hrs without worry because it was an emergency. Oil level checked and full at every fuel fill up!!! 4-5 day oil change interval vs 8-10 day interval during emergency usage is something you should consider.
Honda makes excellent synthetic small engine oils. I would definitely stick with higher z/p oils, or HTHS, or both!
The aftermarket make some screw on funnels and magnetic dipsticks.
And, my EU2000's, 2200's, and 3000's.... never had an issue with 5w30 sae30 0w40....
SJ and synthetic and should be found at any dealer locally:
Buy Honda Pro HP4S Full Synthetic 4-Stroke Motor Oil 10W-30 32 oz.: Motor Oils - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
Useable in both diesel and gasoline engines, Shell ROTELLA® T6 Multi-Vehicle Full Synthetic is a synthetic diesel oil providing peak performance and exceptional fuel economy. Learn more this product here.
rotella.shell.com
And, what I typical use with an online order:
HIGH PERFORMANCE ENGINE OIL (WITH SYNERLEC®) HPS is recommended for use in gasoline and diesel automotive, commercial fleet and stationary industrial
www.royalpurple.com
High-Performance Motor Oil
www.redlineoil.com
Shop 10W-30 Synthetic Small Engine Oil at AMSOIL. Find premium synthetic oil, filters and more online. Fast, free shipping available.
www.amsoil.com
What I can't find locally but would consider:
Torco SR-5R racing oil was developed for severe racing conditions and offers the highest level of performance and protection for highly modified race engines.
torcousa.com
MPT® Thirty-K High Performance Full Synthetic Motor Oils The Thirty-K Line of full synthetic high performance motors oils are comprised of 100% true synthetic ester and polyalpaolefin (PAO) base stocks with no highly refined petroleum (Group I, II or III) or viscosity modifiers. MPT Thirty-K...
mptindustries.com
Learn how Mobil Delvac™ Extreme 10W-30 synthetic diesel oil can help prolong engine life and reduce oil changes.
www.mobil.com
My last generators service were refilled with this from Napa, since they didn't have any of the above:
Shop 10W-30 Synthetic Metric Motorcycle Oil at AMSOIL. Find premium synthetic oil, filters and more online. Fast, free shipping available.
www.amsoil.com
All my engines were broken in on synthetic too.
And, all my small engines run well-stabilized ethanol free G100. No E10 foolishness here! Walmart sells 93 octane ethanol free 100% gasoline at the pumps around here, but can source from the local Chevron and PureGas stations too. The benefit of living near the ocean is the fuel pumps cater to boaters!
VP Fuel Stabilizer keeps 2 & 4 cycle engines running smoothly, protects against gum & varnish buildup, & ethanol-related damage. Use for long-term storage.
vpracingfuels.com
America's Most Preferred Marine Treatment Engineered to combat the effects of harsh marine climates Provides defense against the harmful effects of ethanol-blended fuels Industry-leading water removal properties Cleans the fuel system of watersport engines to ensure it operates at peak p
www.goldeagle.com
One of the easiest ways to maintain your snow blower or lawn mower engine for seasons to come is by using fuel stabilizer.
www.briggsandstratton.com
Star Tron Enzyme Fuel Treatment is a multi-functional fuel additive that uses enzyme technology to stabilize fuel and make engines run smoothly and efficiently.
www.starbrite.com
And, if the jugs of fuel are over a year old, I just fill the cars with them and refresh my fuel storage tanks.