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Do you know what the criteria for them to automatically do the GC test is? and for TBN? I guess all of my samples have just lost (or started out low) enough viscosity up to now to automatically warrant the GC. Is it based on a % deviation from some particular value within the specified SAE...

On the samples I submit to Polaris through their Horizon app I’ve been indicating in my comments that I want GC fuel dilution and base number testing. It has not been a problem over the past 6 months with no upcharges. I want to avoid a situation where they don’t give me GC fuel dilution...

Thanks for the UOA. Please continue to keep us updated in the future as I’m pleased that we can have some Amsoil SS UOA for this engine.

Not that I’ve heard of. Apparently special break-in oil isn’t necessary with modern materials like moly coated piston rings and plateau cylinder honing. The cylinders are mostly broken in within the first few minutes of engine operation. As an aside air cooled airplane engines still call for...

He did touch on a point I’ve wondered about: the effect of going outside OEM recommended grades on the hydraulic actuation function of oil within the engine e.g. VCT phasers. There are a lot of BITOG threads pointing out that BMW and Ford recommended oils ranging from 5W-20 to 10W-60 across...

lol he said at 20m34s that you can do ~4 oil analyses, compare wear metals, then ascertain the relative suitability of SAE 20 vs SAE 30 in your own engine.

It’s normal to need to remove and overhaul/replace cylinders between rebuilds. They are built in a modular fashion so that it only takes a few hours or even less to take a cylinder off. I think more than half of new or recently overhauled small airplane engines up needing some kind of “top...

It’s sometimes recommended to do a double oil change before a UOA on a new type of oil, so after 500 miles on a new type I change it again. A more reasonable approach would probably be just to wait for a second full oil change interval before doing a UOA. The double change is what a popular...

Just a try from a driver, not an engineer, no googling: Frames are vertical structural components that are placed at periodic intervals along the longitudinal axis of the airplane's fuselage. I would think the numerous frames are needed in pressurized airplanes especially to keep the skin...

Guess I need to somehow persuade my wife to stop filling up with the Kroger non top-tier at the grocery store? At least shell will honor their points discounts. Was hoping that the bottle of Techron complete prior to an oil change might mitigate the problems but it sounds like that additive is...

87 octane of whatever brand the wife finds since it is her Bronco. I put a 20 fl oz bottle of Techron complete fuel system cleaner in the fuel on the last tank before oil change.

Wow, thank you! Great response and much appreciated!

I recently acquired this John Deere X738 “tractor”(?). As best I can tell it is a 2013 model with 88 hours of run time. It came with a snowblower, snow plow, and 48” mower deck. I will use it about 10 hours per year in winter at temps from -20 to 30F mostly with the snow blower attachment to...

Here it is with fuel dilution and base no.. I wasn’t sure if I’d get those but am glad they reran it.

This was a 4100 mile run of Mobil 1 Advanced Fuel Economy 0W-30 in a '23 Ford Bronco with the 2.7L ecoboost twin turbo on a Fram Synthetic Endurance cartridge filter; 24,500 on the odo. It was mostly 6 months of winter short trip city driving with a 700 mile road trip about 3000 miles into the...

I talked to some reps from champion at a trade show this weekend and they confirmed that flow was the primary concern of the design. They argued that SAE 50 oil needed a different type of filter than SAE 30 or 20 like most cars use, and that the efficiency didn’t need to be as high with the...

I’ll run it for a year and change out. It’s strange with a 12 year old engine but the high Si could be still due to the low run time/wear in? 200 hours is only equivalent to about ~7000 miles if the engine were on a car averaging 35 mph, I think. They also replaced a water pump last year...

Ran this 12 year old generator for 16 hours on this oil over 7 months with a Kohler brand filter. This was about 4 hours of runtime from its twice a month 20 minute maintenance runs and 12 hours during a wind storm. It is a whole-house standby 38kW generator with 195 hours total run time. It...

I found it interesting that he carefully worded the wear statement: “Just because you increase the viscosity of the oil doesn’t mean you’re getting better engine protection….not every time does that increase in viscosity equate to lower wear in the used oil samples.” There would seem to be...

The main problem with the automotive conversions is the gear reduction system. The simplicity and reliability of a direct drive engine is tough to beat. With that said, Rotax has what seems like a good geared offering with their 916is turbo which is rated at 160 HP for takeoff and 137 HP...