I ran Lucas on a trip to Utah this past June.
In 30 mph in traffic with the outside temps at 100f my front head temp peaked at 360 with no problems.

Last week I did an oil change with new cams, this time iI decided to try Royal Purple syn.
What a mistake, in traffic my head temp max at 327f then I had a lifter bleed down. No more RP for me, it can't take the heat.
I will be switching back to Lucas tomorrow

 

Ok, here are some good and popular engine oil. They all meet OEM minimum requirements, and some are exceeding them.

Witch is the best of the best ? It's hard to tell because it always depend on the way you are riding, the temperature conditions and the kind of environment you are riding in.

True synthetic oils
Amsoil ARO 20W50: 100% synthetic, Groupe IV PAO base, 2000ppm Zinc
Prolab Legend 20W50: 100% synthetic, Groups IV/V PAO/Ester blend base, 2000ppm Zinc
Red Line 20W50: 100% synthetic, Groupe V Ester base, 1000ppm Zinc

Synthetized mineral base oils
Harley SYN3 20W50: Hydro-cracked synthetic, Group III mineral base, 2000ppm Zinc
BMW 15W50: Hydro-cracked synthetic, Group III mineral base, 1100ppm Zinc
Castrol 20W50: Hydro-cracked synthetic, Group III mineral base, 1300ppm Zinc
Mobil 1 20W50: Hydro-cracked synthetic, Group III mineral base, 1300ppm Zinc
Royal Purple 20W50: Hydro-cracked synthetic, Group III mineral base, 1000 ppm Zinc
Valvoline MAX 20W50: Hydro-cracked synthetic, Group III mineral base, 900ppm Zinc

Engine oil is sensitive to so much things; idle vs. high speed, heat vs. cold, humidity vs. dryness, altitude vs. sea level. An engine wears at a certain rate - sometimes slow, sometimes fast. The rate at which this wear occurs can indeed be influenced by lubrication in many ways. In certain exceptional cases, wear can be nearly held in check. Nurture your oil and you nurture your engine. After all, what comes in more regular contact with the engine’s critical frictional surfaces than the lubricant that bathes them?

Of course there are those fortunate few who can afford the best of everything. They are surrounded by all the high-quality possessions of a life of luxury. As such, they would not settle for anything short of the best for their bikes and its accessories, including the best motor oil and the best filter. However, when it comes to lubrication, the best is indeed a foggy concept - after all, don’t most of the major suppliers of lubricant claim to have premium products that are the best? What defines the best? Cost? Aggressive advertising?

Many bike enthusiasts are totally preoccupied with the love affair they have with their bikes. They belong to clubs, hang out at garages and auto parts stores, have an extensive collection of tools, and of course take great pride in talking about the specific motor oil they use. Their lubrication decisions are often rooted in tradition, loyalty and the habits they have formed.

A surprising large number of us are controlled by fear of criticism and embarrassment. We want to know what everyone else is doing so that we can go with the flow. If our father, brother, sister and best friend all use a conventional 20W50 Brand X motor oil, we wouldn’t dare consider anything else. After all, we can’t be criticized if we follow the recommendations of our network of personal advisors.

Finally there is a category of bikers who really don’t care. They trust that any oil sold commercially by a household-name oil company is good enough for them. They don’t want to be bothered with the details of having to analyze the available alternatives. To them, ignorance is bliss.

So... like I said before, you probably have tried many brands and finaly found something that really fits your needs? Stick with it and have great rides !

By the way, I'm working for Prolab and it's not available in USA... yet!

 

Good post, but you are saying the RP ran cooler than the Lucas? You think the RP caused the lifter to bleed down?

 

Nah, there is no REAL riding in NC. We just have the Dragon and the Blue Ridge Parkway, oh and also Mount Pilot, nah none at all

Oh and my education? HAHA! I have an MBA from Cornell University, yes the Ivy League College.

Ruin someone else's thread trailer park, we are having a constructive conversation here. Here is some of that terrible scenery.

 

No, I switched from 255 cams to Andrews 57h last week, this made the bike run cooler. (besides, Mt Zion National Park is 3-4k above sea level and it was 100f) I also tried RP for the first time during the swap.

I was in traffic at a 4 way stop sign about 25 cars back. Stop and go stop and go, it was about 90*f out here in San Diego (sea level) my head temp was at 327 when I got to the stop sign and that's when I heard one of my lifters start knocking.
I knew it was the oil breaking down because of the heat, had I sat long enough I'm sure the rest of the lifters would have started making noise.

 

Gotcha JustDave,

I haven't modified my Breakout any yet. I rode today for about 30 miles, just a short ride and my dipstick was so hot on the handle I couldn't touch it. Now, that has me a bit concerned.

I know he bikes are very lean from the factory, but not sure I have ever had a dipstick get that hot.

 

Been running Mobil 1 v-twin in my Heritage and Cessna. Im still here, lol

 

As I am sure you will be for a long time! Mobil is good oil.

 

Oh it's lean alright, the stock map for my Heritage is 14.5-14.7 across the board.

 

I have lucas in all three holes.Im going to send the engine oil sample off this week.I really like there harley tranmission oil.I changed to valvaline 75w140 synpower and the transmission has a lot of clatter in 5th and 6th.I didn't even want to use 6th.I didnt realize how smooth the lucas was.So to me not all gear oil is the same.I will post the results of the lucas engine oil sample.Ive never noticed much difference in primary oils.The S&S 75w140 transmission oil also a smooth shifting transmission oil.I think I will stick with motorcycle oils and stay away from automotive lubes.