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296km today up in the mountains. IPA time for sure. Cheers Tom. Sent fra min SM-S906B via Tapatalk

I don't see anything there that resembles our (four) V11 Eagle "tags" that come so easily unglued . . . @sp838's 3D prints from some time ago (not sure if they are still available):

I just let AI do some work for me docc. First search "is Mobil1 a group 4 oil" Yes it is. Then I looked at the dates of the info. Did the same search with 2025 at the front and "no it's now a group 3 base oil" Looks like you were right AND Mobil have turned into the usual modern day corporate scoundrels. Bit like 50% of the packaged food these days in the supermarket. The shelf price is the same as usual but they gradually reduce the qty of the product. Cadbury chocolate bars used to be 200gms and now quietly they have been reduced to 180gms. Pringles moved their factory to New Zealand and the size of their chips shrunk. Corporate bastards. Phil

The recurring take-away regarding "manufacturers' recommendations" : Due to the increasingly stringent approval regulations . . . This is certainly the case with reduced zinc and phosphorous (ZDDP) considered desirable for our flat tappet engines. The matter of PAO and ester base oils being obscured has much to do with what oil manufacturers can get by with (cheaper, easier to source base oils) while still marketing, and charging for, a "synthetic" product. A couple things I learned from well informed other sources about the desirability of pure (group 4 group 5) is vastly improved shear resistance (stable viscosity over the service life) and near-zero evaporative losses from heat (something to consider with air cooled motors with funky crankcase ventilation systems).

Just feeling a bit funky.

Let's all pony up to fact that what we are being sold as "AI" is neither artificial nor intelligent. It is a function of search engines being populated by algorithms designed by software engineers that are working for various entities that designate the outcome parameters.

Spoke to tech support at Mobil 1 this morning. He couldn't tell me the type, said it is proprietary info. But he said the V twin 20w50 they make is specifically for air cooled four strokes. It has a much higher percentage of zinc in it than their 15w50, which has much less zinc and is considered an auto oil. Their 5w40 racing motorcycle oil is formulated for Japanese water cooled engines, which maintain a more constant temp. So for now, I'll stick with the V-twin Mobil 1 and do some more digging into Redline, Liqui Moly and some of the others. In the end, I agree with Pete's point. Put some oil in it. Simple, but true.

I'm going to paraphrase and take licence with Pete's notion- "It's all Bulls**t". The only thing I'll add here is that the larger the "w" spread, the more quickly the oil breaks down. Temperature causes polymerization and cooling reverses. Not that this is any consideration in our case, 'light usage.' Straight weight oil is often recommended for stationary equipment where service intervals are long.

Castrol GTX was popular with the street racers back in the '70s here and I became a devoted Castrol fan. Decades later, a respected auto mechanic told me he did not care for their products as they discolored the engine internals to a brown/bronze coloration. I had just thought that's what color engines were inside! So, I moved on to Mobil1, then Lucas in mySport. After learning about base oils (thanks, Richard Widman) and what "synthetic" means (or doesn't) in this country I selected RedLine and never looked back. s said, we all have our preferences and mySport has always had some oil in it, typically with 5,000 mile changes.